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1, 1, 2, 9, 48, 300, 2280, 20580, 211680, 2434320, 31134600, 438807600, 6744276000, 112237725600, 2011760150400, 38639999197800, 791610365145600, 17230493212732800, 397111119429024000, 9660782144094681600, 247393077222459168000, 6651976858409613931200
(列表;图表;参考;听;历史;文本;内部格式)
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