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1, 1, 2, 6, 24, 120, 600, 3480, 22800, 164880, 1285920, 10516320, 92931840, 877374720, 8762014080, 91819440000, 1005716908800, 11584953158400, 139521689740800, 1748830512960000, 22750446292531200, 306931140411955200, 4296645083802470400, 62213458150660147200
(列表;图表;参考文献;听;历史;文本;内部格式)
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