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1, 0, 1, 1, 4, 5, 30, 42, 336, 504, 5040, 7920, 95040, 154440, 2162160, 3603600, 57657600, 98017920, 1764322560, 3047466240, 60949324800, 106661318400, 2346549004800, 4151586700800, 99638080819200, 177925144320000, 4626053752320000, 8326896754176000
(列表;图表;参考;听;历史;文本;内部格式)
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