View Code of Problem 3695

#include <iostream>
#include <cstdio>
using namespace std;
int main(){
    int t,n;
    long a[999],sum;
    cin>>t;
    while(t--){
        cin>>n;
        sum=0;
        a[1]=1,a[2]=2;
        for(int i=3;i<=n;i++){
            a[i]=a[i-1]+a[i-2];
            sum+=a[i];
        }
        if(n==1)
            cout<<1<<endl;
        else if(n==2)
            cout<<3<<endl;
        else
            cout<<sum+3<<endl;
    }
    return 0;
}