nyOJ基础题：另一种阶乘问题 如1!!+2!!+3!!

#include<stdio.h>

int jCheng[21];//as you like
void generateSpecialJCheng(int input){
    //!!阶乘存入第k个位置
    for(int k = 1; k <= input; ++k){
        int summary = 1;
        for(int s = 1; s <= k; s += 2){
            summary *= s;
        }
        jCheng[k] = summary;
    }
}

int main(){

    generateSpecialJCheng(20);
    int loop_rounds;
    while(~scanf("%d", &loop_rounds)){
        while(loop_rounds--){
            int t;
            unsigned long long total = 0;
            scanf("%d", &t);

            for(int i = 1; i <= t; i++){
                total += jCheng[i];
            }

            printf("%I64u\n", total);
        }
    }
    return 0;
}
/*
样例输入
2
3
5
样例输出
5
23
*/