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0, 2, 24, 360, 3360, 31500, 266112, 2186184, 17297280, 133899480, 1016158000, 7596797208, 56073378816, 409544426200, 2964295807200, 21289879620000, 151876184302080, 1077036279535260, 7597848475324800, 53348055809155800, 373012706986920000, 2598270875886525840
(列表;图表;参考;听;历史;文本;内部格式)
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