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1, 0, 2, 3, 18, 50, 215, 735, 2898, 10668, 41202, 156090, 601623, 2308878, 8923343, 34487453, 133749330, 519277512, 2020262660, 7869597840, 30699524018, 119894389380, 468768069882, 1834589752182, 7186572436887, 28175111736300, 110547143014050, 434049816801900
(列表;图表;参考文献;听;历史;文本;内部格式)
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