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1, 0, 1, 4, 13, 40, 131, 424, 1428, 4848, 16795, 58740, 208011, 742768, 2674425, 9694416, 35357669, 129643320, 477638699, 1767258324, 6564120287, 24466250224, 91482563639, 343059554440, 1289904147310, 4861946193440, 18367353070722, 69533550173100, 263747951750359
(列表;图表;参考;听;历史;文本;内部格式)
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