from math import factorial
def com(n,r):
  return factorial(n)//factorial(r)//factorial(n-r)
def main():
  from sys import stdin
  readline=stdin.readline
  t = int(readline())
  mod = 998244353
  for i in range(t):
    n = int(readline())
    if n == 1:
      print(2)
      continue
    ans = 0
    for r in range(n):
      ans += 2**r * com(n-1,r)
      ans %= mod
    print(ans*2%mod)
main()