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1, 1, 2, 6, 19, 67, 261, 1043, 4339, 18503, 80384, 354740, 1585917, 7161755, 32631452, 149791796, 691983065, 3214568803, 15005803890, 70346777076, 331038719877, 1563084382317, 7402900834627, 35156932411463, 167377476828587, 798660481273445, 3818763850454642, 18293807958359356, 87789006215473697
(列表;图表;参考;听;历史;文本;内部格式)
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