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1, 2, 8, 30, 110, 406, 1498, 5526, 20386, 75206, 277442, 1023510, 3775826, 13929382, 51386818, 189570870, 699345010, 2579950406, 9517682978, 35111639766, 129530186066, 477849203686, 1762831262722, 6503252567670, 23991118635826, 88505523568262
(列表;图表;参考;听;历史;文本;内部格式)
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