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0, 0, 2, 6, 36, 240, 2040, 20160, 231840, 3024000, 44271360, 718502400, 12813292800, 249080832000, 5243151513600, 118824010905600, 2884729655808000, 74694359900160000, 2054806272110592000, 59849389401145344000, 1840003788783992832000, 59545276650123264000000
(列表;图表;参考;听;历史;文本;内部格式)
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