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1, 4, 15, 47, 143, 412, 1157, 3170, 8534, 22631, 59295, 153768, 395297, 1008606, 2556663, 6443702, 16158018, 40334613, 100277824, 248396782, 613265776, 1509538293, 3705476893, 9072944868, 22163755695, 54026509101, 131433905615
(列表;图表;参考;听;历史;文本;内部格式)
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