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1, 1, 3, 10, 36, 139, 567, 2354, 10051, 43745, 192742, 858883, 3869637, 17569721, 80307106, 369430312, 1708635040, 7938060632, 37034246311, 173437700581, 814901766911, 3840290612220, 18148048110860, 85975458675768, 408225045863473, 1942410972814486, 9260276749410251, 44226028788343006
(列表;图表;参考;听;历史;文本;内部格式)
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