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1, 1, 2, 6, 24, 120, 720, 4320, 29520, 225360, 1890720, 17169120, 166112640, 1680462720, 18189031680, 209008512000, 2532028896000, 32143053484800, 425585741760000, 5865854258188800, 84489178710067200, 1266667808011315200, 19700712491727974400
(列表;图表;参考;听;历史;文本;内部格式)
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