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0, 1, 1, 6, 4, 30, 15, 140, 56, 630, 210, 2772, 792, 12012, 3003, 51480, 11440, 218790, 43758, 923780, 167960, 3879876, 646646, 16224936, 2496144, 67603900, 9657700, 280816200, 37442160, 1163381400, 145422675, 4808643120, 565722720, 19835652870, 2203961430
(列表;图表;参考;听;历史;文本;内部格式)
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