n个元素,入栈序列为1 2..n,有多少种出栈序列

1 1 + n ( 2 n n ) \frac{1}{1+n}{2n \choose n} 1+n1(n2n)
1 1 + n \frac{1}{1+n} 1+n1Cn2n
(我真的不懂markdown语法。。。)

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转载自blog.csdn.net/qq_45769627/article/details/109667308