#define _USE_MATH_DEFINES
 
#include <iostream>
#include <iomanip>
 
#include <algorithm>
#include <cmath>
 
#include <string>
//#include <array>
#include <list>
#include <queue>
#include <vector>
#include <complex>
#include <set>
#include <map>
 
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
 
#define PII pair<int,int>
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////
LD dp[1000000];
int main(void){
    std::cin.tie(0); 
    std::ios::sync_with_stdio(false);
    std::cout << std::fixed;//
    cout << setprecision(15);//
	
	int T,N;
	cin>>T;
	LD ans[50];
	for(int Lcount=0;Lcount<T;++Lcount){
		cin>>N;
		for(int i=0;i<6;++i){
			dp[N+i] = 0;
		}
		for(int i=N-1;i>=0;--i){
			dp[i]=dp[i+1]+2*dp[i+2]+3*dp[i+3]+dp[i+4]+3*dp[i+5]+2*dp[i+6] + 12;
			dp[i] /=12.0;
		}
		ans[Lcount] = dp[0];
	}
	rep(i,T){
		P(ans[i]);
	}
	return 0;
}