py循环4:无穷数列前n项为: 3、5、7、..2n+1),输入n的值，计算出这一数列的前n项的连乘积。

n = int(input("请输入n的值："))
product = 1
for i in range(1, n+1):
num = 2 * i - 1
product *= num
print("前", n, "项的连乘积为：", product)