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0, 0, 1, 2, 6, 16, 60, 240, 840, 3584, 16800, 96000, 475200, 3041280, 19219200, 153753600, 864864000, 6560153600, 47048601600, 439934976000, 3192583680000, 31434670080000, 280947363840000, 3296449069056000, 27139515346944000, 308787374614118400
(列表;图表;参考;听;历史;文本;内部格式)
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