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1, 1, 1, 2, 6, 17, 53, 205, 871, 3876, 18820, 99585, 558847, 3313117, 20825145, 138046940, 959298572, 6974868139, 52972352923, 419104459913, 3446343893607, 29405917751526, 259930518212766, 2376498296500063, 22441988298860757, 218615700758838253
(列表;图表;参考;听;历史;文本;内部格式)
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