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1, 1, 2, 9, 16, 85, 876, 2359, 11320, 86265, 2064700, 6086971, 37979844, 226139797, 2607277050, 117848675715, 402264826576, 2747761713745, 18051206547132, 155733808506211, 2301810017460220, 187092586844572941, 714557570758041802, 5548996853444210827
(列表;图表;参考;听;历史;文本;内部格式)
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