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1, 2, 7, 23, 84, 320, 1262, 5098, 21051, 87729, 371394, 1584946, 6832849, 29666458, 129708627, 570060258, 2519251688, 11178295951, 49819703001, 222797463880, 999874253662, 4500199157553, 20313008617526, 91912052460063, 416903349368491, 1894989864295280, 8631524632718693, 39387758710865188
(列表;图表;参考;听;历史;文本;内部格式)
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