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1, 1, 1, 2, 5, 15, 42, 120, 338, 952, 2671, 7494, 21035, 59115, 166432, 469560, 1327802, 3763545, 10692500, 30447858, 86894361, 248506757, 712109662, 2044402512, 5879579540, 16937048040, 48864612667, 141179970820, 408444645375, 1183143522435, 3431241484224, 9961919944284
(列表;图表;参考;听;历史;文本;内部格式)
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