MOD = 998244353

N = int(input())
C = [input() for _ in range(N)]

ans = 0
for bit in range(1<<(N-1)*2):
    if bit.bit_count() != N-1:
        continue
    S = [C[0][0]]
    h, w = 0, 0
    for i in range((N-1)*2):
        if not 1<<i & bit:
            h += 1
        else:
            w += 1
        S.append(C[h][w])
    ans += S == S[::-1]
    ans %= MOD

print(ans)