“Catalan numbers”的概念、定义、翻译、参考文献-科学参考

单词	Catalan numbers
释义	Catalan numbers Mathematics Numbers of the form $C_{n} = \frac{1}{n + 1} (\begin{matrix} 2 n \\ n \end{matrix}) =$ $\frac{(2 n)!}{(n + 1)! n!}$ for n ≥ 0. The first few Catalan numbers are 1, 2, 5, 14, 42…. These numbers arise in various combinatorial ways.
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