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1, 0, 1, 2, 6, 40, 155, 1050, 7175, 49000, 427140, 3649800, 34634985, 359579220, 3844835995, 44765971250, 546966720300, 7013372766400, 95334357393275, 1349949069418950, 20031683836289125, 310545507994221500, 5003248923131208750, 83939793691225972500
(列表;图表;参考文献;听;历史;文本;内部格式)
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