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1, 1, 3, 10, 39, 159, 693, 3101, 14292, 67116, 320448, 1549834, 7579037, 37406737, 186102602, 932294987, 4698796087, 23809155711, 121219100012, 619800529792, 3181291257740, 16385813881342, 84666104373097, 438742341955132, 2279628504172080, 11873579440176774, 61984238371422197
(列表;图表;参考;听;历史;文本;内部格式)
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