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-1, 0, 2, 12, 72, 520, 5040, 67284, 1156736, 23655888, 549676800, 14216252380, 405068387328, 12624364306008, 427599019108352, 15646376279614500, 615155126821355520, 25861820048469628576, 1157706908035331457024, 54977324662490442177708, 2760439046217459138560000
(列表;图表;参考文献;听;历史;文本;内部格式)
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