输入n，求1+2!+3!+...+n!的和

输入n，用递推法编程求1+2!+3!+…+n!的和并输出 [输入样例] 5 [输出样例] 153python n =int(input('Input:')) sum = 0 term = 1 for i in range(1,n+1): term *= i sum += term print(sum)

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