import dataclasses
import sys

sys.setrecursionlimit(500005)
stdin = sys.stdin

ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
ns = lambda: stdin.readline().strip()


@dataclasses.dataclass
class State:
    clus: [int]
    val: int
    hidden: int

    def h(self):
        return (*self.clus, self.hidden)

MOD = 1000000007

def normalize(a: [int]) -> [int]:
    label = {}
    p = 0
    for i in range(len(a)):
        if a[i] == -1:
            continue
        if a[i] not in label:
            label[a[i]] = p
            p += 1
        a[i] = label[a[i]]
    return a

def add(s: State, dp: [int, State]):
    key = s.h()
    if key in dp:
        dp[key].val = (dp[key].val + s.val) % MOD
    else:
        dp[key] = s

n, m = na()
initial = State([-1] * n, 1, 0)
dp: [int, State] = {}
dp[initial.h()] = initial

for j in range(m+1):
    for i in range(n):
        ndp = {}
        for s in dp.values():
            # 黒いセルを追加
            nclus = [n] + s.clus[:-1]
            if i > 0 and s.clus[0] != -1:
                for k in range(1, n):
                    if nclus[k] == s.clus[0]:
                        nclus[k] = n
            if s.clus[-1] != -1:
                for k in range(1, n):
                    if nclus[k] == s.clus[-1]:
                        nclus[k] = n
            normalize(nclus)
            ns = State(nclus, s.val, s.hidden)
            add(ns, ndp)

            nclus = [-1] + s.clus[:-1]
            nhidden = s.hidden
            if s.clus[-1] != -1 and all(s.clus[_] != s.clus[-1] for _ in range(n-1)):
                nhidden += 1
            numclus = nhidden + (1 if any(_ != -1 for _ in nclus) else 0)

            if numclus <= 1:
                normalize(nclus)
                ns = State(nclus, s.val, nhidden)
                add(ns, ndp)
        dp = ndp

ans = 0
for s in dp.values():
    if s.hidden == 1 and all(_ == -1 for _ in s.clus):
        ans += s.val
print(ans % MOD)