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1, 1, 2, 4, 11, 27, 92, 252, 906, 2787, 10191, 31594, 125998, 393021, 1535964, 5161328, 20221291, 66306664, 273756969, 897440988, 3664037417, 12621555612, 50496343297, 170909672792, 725703552284, 2427269270146, 9982179588261, 35179417316991, 143999051236064
(列表;图表;参考;听;历史;文本;内部格式)
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