from collections import defaultdict, deque
from pickletools import read_decimalnl_long
import sys
readline=sys.stdin.readline
write=sys.stdout.write

T=int(readline())
mod=998244353
for t in range(T):
    N=int(readline())
    dp=[0]*N
    dp[0]=2
    for i in range(1,N):
        dp[i]=2*(sum(dp)+1)%mod
    ans=dp[N-1]
    print(ans)