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1, 1, 2, 4, 10, 27, 84, 270, 904, 3149, 11221, 41052, 153615, 585423, 2266898, 8899882, 35367261, 142063183, 576212939, 2357624559, 9722575246, 40382761328, 168823553558, 709990487405, 3002235850977, 12759119302740, 54477236422389, 233603326611414, 1005725216037108, 4346070952878284
(列表;图表;参考;听;历史;文本;内部格式)
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