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2, 10, 70, 574, 5002, 44530, 399310, 3589414, 32291602, 290585050, 2615147350, 23535971854, 211822683802, 1906400965570, 17157599124190, 154418363419894, 1389765184685602, 12507886403890090, 112570976860169830, 1013138789417005534
(列表;图表;参考;听;历史;文本;内部格式)
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