程序代码：

#include<stdio.h>
int sum(int a)
{
    int i;

    if(a==1)
    {
        i=1;        }
   
    else
    {
        i=sum(a-1)*sum(a-1)*sum(a-1)+2;
            }
    return(i);
}
int main()
{
    int n,a;
    printf("input the number:");
    scanf("%d",&n);
    a=sum(n);
    printf("%d\n",a);
    return 0;
}