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1, 1, 5, 30, 165, 1001, 6198, 38760, 245157, 1562331, 10015005, 64512240, 417226230, 2707475148, 17620076360, 114955810530, 751616304549, 4923689695575, 32308782871911, 212327989773900, 1397281501935165, 9206478467531865, 60727722660586800, 400978991944396320
(列表;图表;参考;听;历史;文本;内部格式)
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