25 求1+2!+3!+...+20!的和

"""
求1+2!+3!+...+20!的和
"""

a = 1
result_list = [a]

for i in range(2, 21):
    a = i * a
    result_list.append(a)

print("1! + 2! + 3! + ... + 20! = %d" % sum(result_list))
`