#include <stdio.h>
//練習問題F
 
int func(int n){
    int a=-1;
    int i;  
for (i=1;i<=n;i++){
	a=3*a+5;
}
return a;
}
int main(void) {
	int n = 3;
    printf("数列anについて, n=%dのときの値は%d\n", n
, func
(n
)); 	return 0;
}
 
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