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1, 1, 2, 4, 9, 20, 48, 115, 286, 718, 1840, 4761, 12473, 32938, 87716, 235119, 634120, 1719126, 4682962, 12810093, 35176103, 96925151, 267912108, 742665338, 2064139687, 5750927832, 16058703976, 44935017987, 125978892299, 353827590946, 995440328858
(列表;图表;参考;听;历史;文本;内部格式)
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