dp = [0 for _ in range(10**6 + 1)]
mod = 998244353
dp[2] = 26 * 25
for i in range(3, 10**6 + 1):
    dp[i] += 26 * dp[i - 2] % mod
    dp[i] %= mod
    if i % 2 == 1:
        dp[i] += 26 * 25 * 2 * pow(26, (i - 1) // 2 - 1, mod) % mod
    else:
        dp[i] += 26 * 25 * (2 * pow(26, i // 2 - 1, mod) - 1) % mod
    dp[i] %= mod

t = int(input())
for _ in range(t):
    print(dp[int(input())])