java 输出1~N的数的阶乘之和

package Code01;

import java.util.Scanner;

public class factorial {

//    阶乘时间算法复杂度
    public  static void fac_one(int m){
        int rec = 1;
        int sum = 0;
        for(int j=1;j<=m;j++){
            rec = rec*j;
            sum += rec;
        }
        System.out.print(sum);
    }

    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        int num = s.nextInt();
        fac_one(num);
    }
}

5
153  

10
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