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1, 2, 6, 24, 120, 720, 4920, 37320, 309120, 2763720, 26440920, 268864320, 2889978120, 32689371720, 387638491920, 4803456571320, 62026296732120, 832595493624720, 11592967532632920, 167119530011233320, 2489936579950221120, 38283169922493447720
(列表;图表;参考;听;历史;文本;内部格式)
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