from random import getrandbits, randrange
from string import ascii_lowercase, ascii_uppercase
import sys
from math import ceil, floor, sqrt, pi, factorial, gcd, log, log10, log2, inf, cos, sin
from copy import deepcopy, copy
from collections import Counter, deque, defaultdict
from heapq import heapify, heappop, heappush
from itertools import (
    accumulate,
    product,
    combinations,
    combinations_with_replacement,
    permutations,
)
from bisect import bisect, bisect_left, bisect_right
from functools import lru_cache, reduce
from decimal import Decimal, getcontext
from typing import List, Tuple, Optional


inf = float("inf")


def ceil_div(a, b):
    return (a + b - 1) // b


def isqrt(num):
    res = int(sqrt(num))
    while res * res > num:
        res -= 1
    while (res + 1) * (res + 1) <= num:
        res += 1
    return res


def int1(s):
    return int(s) - 1


from types import GeneratorType


def bootstrap(f, stack=[]):
    def wrapped(*args, **kwargs):
        if stack:
            return f(*args, **kwargs)
        else:
            to = f(*args, **kwargs)
            while True:
                if type(to) is GeneratorType:
                    stack.append(to)
                    to = next(to)
                else:
                    stack.pop()
                    if not stack:
                        break
                    to = stack[-1].send(to)
            return to

    return wrapped


import sys
import os

input = lambda: sys.stdin.readline().rstrip("\r\n")

print = lambda *args, end="\n", sep=" ": sys.stdout.write(
    sep.join(map(str, args)) + end
)


def II():
    return int(input())


def MII(base=0):
    return map(lambda s: int(s) - base, input().split())


def LII(base=0):
    return list(MII(base))


def NA():
    n = II()
    a = LII()
    return n, a


def read_graph(n, m, base=0, directed=False, return_edges=False):

    g = [[] for _ in range(n)]
    edges = []
    for _ in range(m):
        a, b = MII(base)
        if return_edges:
            edges.append((a, b))
        g[a].append(b)
        if not directed:
            g[b].append(a)
    if return_edges:
        return g, edges
    return g


def read_graph_with_weight(n, m, base=0, directed=False, return_edges=False):

    g = [[] for _ in range(n)]
    edges = []
    for _ in range(m):
        a, b, w = MII()
        a, b = a - base, b - base
        if return_edges:
            edges.append((a, b, w))
        g[a].append((b, w))
        if not directed:
            g[b].append((a, w))
    if return_edges:
        return g, edges
    return g


def iterate_tokens():
    for line in sys.stdin:
        for word in line.split():
            yield word


tokens = None


def NI():
    global tokens
    if tokens is None:
        tokens = iterate_tokens()
    return int(next(tokens))


def LNI(n):
    return [NI() for _ in range(n)]


def yes(res):
    print("Yes" if res else "No")


def YES(res):
    print("YES" if res else "NO")


def pairwise(a):
    n = len(a)
    for i in range(n - 1):
        yield a[i], a[i + 1]


def factorial(n):
    return reduce(lambda x, y: x * y, range(1, n + 1))


def cmin(dp, i, x):
    if x < dp[i]:
        dp[i] = x


def cmax(dp, i, x):
    if x > dp[i]:
        dp[i] = x


def alp_a_to_i(s):
    return ord(s) - ord("a")


def alp_A_to_i(s):
    return ord(s) - ord("A")


def alp_i_to_a(i):
    return chr(ord("a") + i)


def alp_i_to_A(i):
    return chr(ord("A") + i)


d4 = [(1, 0), (0, 1), (-1, 0), (0, -1)]
d8 = [(1, 0), (1, 1), (0, 1), (-1, 1), (-1, 0), (-1, -1), (0, -1), (1, -1)]


def ranges(n, m):
    return ((i, j) for i in range(n) for j in range(m))


def valid(i, j, n, m):
    return 0 <= i < n and 0 <= j < m


def ninj(i, j, n, m):
    return [(i + di, j + dj) for di, dj in d4 if valid(i + di, j + dj, n, m)]


def gen(x, *args):
    if len(args) == 1:
        return [x] * args[0]
    if len(args) == 2:
        return [[x] * args[1] for _ in [0] * args[0]]
    if len(args) == 3:
        return [[[x] * args[2] for _ in [0] * args[1]] for _ in [0] * args[0]]
    if len(args) == 4:
        return [
            [[[x] * args[3] for _ in [0] * args[2]] for _ in [0] * args[1]]
            for _ in [0] * args[0]
        ]


list2d = lambda a, b, v: [[v] * b for _ in range(a)]
list3d = lambda a, b, c, v: [[[v] * c for _ in range(b)] for _ in range(a)]


class Debug:
    def __init__(self, debug=False):
        self.debug = debug
        cur_path = os.path.dirname(os.path.abspath(__file__))
        self.local = os.path.exists(cur_path + "/.cph")

    def get_ic(self):
        if self.debug and self.local:
            from icecream import ic

            return ic
        else:
            return lambda *args, **kwargs: ...


from typing import Union
from functools import lru_cache


class ModInt998244353:

    __slots__ = ["val"]

    @staticmethod
    @lru_cache(maxsize=None)
    def _inv(a: int) -> int:
        res = 1
        b = 998244351
        while b:
            if b & 1:
                res = res * a % 998244353
            a = a * a % 998244353
            b >>= 1
        return res

    @classmethod
    def get_mod(cls) -> int:
        return 998244353

    def __init__(self, val: int) -> None:
        self.val = val if 0 <= val and val < 998244353 else val % 998244353

    def __add__(self, other: Union[int, "ModInt998244353"]) -> "ModInt998244353":
        return ModInt998244353(
            self.val + (other if isinstance(other, int) else other.val)
        )

    def __sub__(self, other: Union[int, "ModInt998244353"]) -> "ModInt998244353":
        return ModInt998244353(
            self.val - (other if isinstance(other, int) else other.val)
        )

    def __mul__(self, other: Union[int, "ModInt998244353"]) -> "ModInt998244353":
        return ModInt998244353(
            self.val * (other if isinstance(other, int) else other.val)
        )

    def __pow__(self, other: Union[int, "ModInt998244353"]) -> "ModInt998244353":
        return ModInt998244353(
            pow(self.val, (other if isinstance(other, int) else other.val), 998244353)
        )

    def __truediv__(self, other: Union[int, "ModInt998244353"]) -> "ModInt998244353":
        return ModInt998244353(
            self.val
            * (self._inv(other) if isinstance(other, int) else self._inv(other.val))
        )

    __iadd__ = __add__
    __isub__ = __sub__
    __imul__ = __mul__
    __ipow__ = __pow__
    __itruediv__ = __truediv__

    def __radd__(self, other: Union[int, "ModInt998244353"]) -> "ModInt998244353":
        return ModInt998244353(
            (other if isinstance(other, int) else other.val) + self.val
        )

    def __rsub__(self, other: Union[int, "ModInt998244353"]) -> "ModInt998244353":
        return ModInt998244353(
            (other if isinstance(other, int) else other.val) - self.val
        )

    def __rmul__(self, other: Union[int, "ModInt998244353"]) -> "ModInt998244353":
        return ModInt998244353(
            (other if isinstance(other, int) else other.val) * self.val
        )

    def __rpow__(self, other: Union[int, "ModInt998244353"]) -> "ModInt998244353":
        return ModInt998244353(
            pow((other if isinstance(other, int) else other.val), self.val, 998244353)
        )

    def __rtruediv__(self, other: Union[int, "ModInt998244353"]) -> "ModInt998244353":
        return ModInt998244353(
            (other if isinstance(other, int) else other.val) * self._inv(self.val)
        )

    def __eq__(self, other: Union[int, "ModInt998244353"]):
        return self.val == int(other)

    def __lt__(self, other: Union[int, "ModInt998244353"]):
        return self.val < int(other)

    def __le__(self, other: Union[int, "ModInt998244353"]):
        return self.val <= int(other)

    def __gt__(self, other: Union[int, "ModInt998244353"]):
        return self.val > int(other)

    def __ge__(self, other: Union[int, "ModInt998244353"]):
        return self.val >= int(other)

    def __ne__(self, other: Union[int, "ModInt998244353"]):
        return self.val != int(other)

    def __neg__(self):
        return ModInt998244353(-self.val)

    def __pos__(self):
        return ModInt998244353(self.val)

    def __int__(self):
        return self.val

    def __str__(self):
        return str(self.val)

    def __repr__(self):

        return f"{self}"


mint = ModInt998244353
mod = 998244353

ic = Debug(1).get_ic()
n, k = MII()

dp = [mint(0)] * (n + 1)
dp[0] = mint(1)
for _ in range(k):
    ndp = [mint(0)] * (n + 1)

    for i in range(n):

        ndp[i + 1] += dp[i] * (n - i)

    for i in range(1, n + 1):

        ndp[i - 1] += dp[i] * i
    dp = ndp

res = mint(0)
for i, cnt in enumerate(dp):

    c2 = (k - i) // 2
    res += (n + c2) * cnt
print(res / mint(pow(n, k, mod)))