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1, 1, 2, 9, 48, 330, 2760, 26670, 295680, 3686760, 51067800, 778239000, 12937478400, 232997965200, 4518981066600, 93905637625800, 2081477759961600, 49020847858382400, 1222400311155223200, 32175639432544608000, 891491725439101987200, 25935626681521134177600, 790459388855441635730400
(列表;图表;参考;听;历史;文本;内部格式)
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