fn main() {
    let mut buf = String::new();
    let mut input = {
        use std::io::Read;
        std::io::stdin().read_to_string(&mut buf).unwrap();
        buf.split_whitespace()
    };

    const MOD: usize = 998244353;

    let t: usize = input.next().unwrap().parse().unwrap();
    let ns: Vec<usize> = (0..t)
        .map(|_| input.next().unwrap().parse().unwrap())
        .collect();

    let n_max = ns.iter().fold(1, |acc, &n| if n > acc { n } else { acc });

    let mut w = vec![];
    for k in 0..=n_max {
        match k {
            0 => w.push(0),
            1 => w.push(2),
            2 => w.push(6),
            _ => w.push((w[k - 1] * 2 + w[k - 1]) % MOD),
        }
    }

    for n in ns.into_iter() {
        println!("{}", w[n]);
    }
}