HDU - 2501 Tiling_easy version

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll dp[35] = {1, 1};
int main()
{
    int T;
    for(int i = 2; i <= 30; i++)
        dp[i] = dp[i - 1] + 2*dp[i - 2];
    cin >> T;
    while(T--)
    {
        int n;
        cin >> n;
        cout << dp[n] << endl;
    }
    return 0;
}