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1, 1, 3, 8, 24, 74, 231, 723, 2265, 7098, 22246, 69724, 218533, 684941, 2146791, 6728628, 21089356, 66099798, 207174811, 649342415, 2035216397, 6378923798, 19993288618, 62664424664, 196407414185, 615594454969, 1929441078187, 6047395073408, 18954187089376
(列表;图表;参考;听;历史;文本;内部格式)
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