mod = 998244353

table_len = 10 ** 5 + 10

fac = [1, 1]
for i in range(2, table_len):
    fac.append(fac[-1] * i % mod)

finv = [0] * table_len
finv[-1] = pow(fac[-1], mod - 2, mod)
for i in range(table_len - 1, 0, -1):
    finv[i - 1] = finv[i] * i % mod


def comb(n, k):
    if k < 0 or n < 0 or n - k < 0:
        return 0
    return fac[n] * finv[k] % mod * finv[n - k] % mod


n = int(input())
s = input()
c0 = s.count('0')
c1 = n - c0

dp = [[0] * (n + 1) for i in range(n + 1)]
dp[0][0] = 1
for i in range(n):
    for j in range(n + 1):
        if i + 2 <= n and j + 1 <= n:
            dp[i + 2][j + 1] = (dp[i + 2][j + 1] + dp[i][j] * (i + 1)) % mod
        if j + 1 <= n:
            dp[i + 1][j + 1] = (dp[i + 1][j + 1] + dp[i][j] * (i - j)) % mod
        dp[i + 1][j] = (dp[i + 1][j] + dp[i][j] * j) % mod

res = 0

for eq0 in range(c0 + 1):
    for eq1 in range(c1 + 1):
        pos_eq = comb(c0, eq0) * comb(c1, eq1) % mod * fac[eq0] % mod * fac[eq1] % mod
        num_eq = comb(c0 + c1, eq0) * comb(c0 + c1 - eq0, eq1) % mod
        pos_neq = dp[c0 - eq0 + c1 - eq1][c0 - eq0]
        pos_neq2 = fac[c0 - eq0] * fac[c1 - eq1] % mod
        res += pos_eq * num_eq % mod * pos_neq % mod * pos_neq2 % mod
        res %= mod

print(res)