求Sn=1!+2!+3!+4!+5!+…+n!之值

以下是两种求Sn=1!+2!+3!+4!+5!+…+n!之值的方法：

1.使用for循环计算阶乘和

n = int(input("请输入n的值："))
sum = 0
factorial = 1
for i in range(1, n+1):
    factorial *= i
    sum += factorial
print("Sn的值为：", sum)

2.使用递归函数计算阶乘和

def factorial(n):
    if n == 1:
        return 1
    else:
        return n * factorial(n-1)
n = int(input("请输入n的值："))
sum = 0
for i in range(1, n+1):
    sum += factorial(i)
print("Sn的值为：", sum)