Catalan numbers
(informal) Someone with astounding good luck.
plural of Catalan number
A municipality of Croatia.
(US, slang) A pimp, especially a prosperous one. / (US, slang) A flirtatious and seductive man.
カタラン数は、有効な括弧の並びや二分木の形の数などの計数問題によく現れます。
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