#include <stdio.h>
//a{n} = -6a{n-1} -9a{n-2}, a{1}=1, a{2}=2(再帰あり版)
int rec(int n){

}

int main(void) {
    int n = 4;
    printf("数列a%dの値は%d\n", n, rec(n));
	return 0;
}