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0, 3, 16, 75, 356, 1770, 9306, 51821, 305232, 1897227, 12411650, 85234864, 612903324, 4604004691, 36050248752, 293659886235, 2483993559376, 21781908622738, 197701336871190, 1854695911048053, 17960309481562600, 179309794875495795
(列表;图表;参考;听;历史;文本;内部格式)
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