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1, 1, 3, 10, 40, 152, 663, 2764, 12535, 54868, 254618, 1149816, 5416066, 24963487, 118813118, 555574475, 2664192114, 12590183411, 60716475411, 289237761617, 1400959354137, 6715638325853, 32640829654516, 157247695092057, 766435077201282, 3707253492778648, 18111174831201882, 87896052331507647
(列表;图表;参考;听;历史;文本;内部格式)
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