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1, 1, 2, 3, 7, 14, 36, 85, 226, 577, 1561, 4158, 11413, 31200, 86722, 241227, 677729, 1908832, 5411431, 15386107, 43949347, 125896209, 361904137, 1043032250, 3014490719, 8732211825, 25353395331, 73759912892, 215007439768, 627844428958, 1836466543942
(列表;图表;参考;听;历史;文本;内部格式)
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