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1, 2, 5, 18, 67, 265, 1099, 4615, 19918, 86872, 384831, 1723134, 7782492, 35456485, 162474523, 749303875, 3471551664, 16159342707, 75510910742, 354110285481, 1666053933555, 7860810672910, 37190149979929, 176363094591082, 838240103613605, 3992076916379348, 19048084412644487, 91045079127716986
(列表;图表;参考;听;历史;文本;内部格式)
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