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1, 1, 7, 93, 1848, 49194, 1646352, 66471138, 3145730760, 170825968008, 10472450056632, 715494753359352, 53913145327125840, 4441896708946850880, 397268517350608957440, 38332384702788360859344, 3969252425402471222357760, 439043217473917940361120000
(列表;图表;参考;听;历史;文本;内部格式)
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