#include <stdio.h>
//a{n+1} = -2a{n} + 4, a{0}=2(再帰あり版)
int rec(int n){
    if(n==0){
       return 2;
    }
    else{
           return -2*rec(n-1)+4;
    }
}
int main(void) {
    int n=5;
    //int m;
    //scanf("%d",&n);
    //scanf("%d",&m);
    for(int i=1;i<=n;i++){
    printf("数列a%dの値は%d\n", i, rec(i));
    //printf("数列a%dの値は%d\n", m, rec(m));
   	}
	return 0;
}