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1, 2, 18, 200, 2450, 31752, 426888, 5889312, 82818450, 1181952200, 17067389768, 248817153312, 3656229836168, 54086240180000, 804670797780000, 12030722505475200, 180648817621276050, 2722858995011344200, 41179040356653045000, 624643836545795220000, 9500832753861545296200
(列表;图表;参考;听;历史;文本;内部格式)
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