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1, 1, 2, 6, 21, 75, 259, 853, 2684, 8120, 23782, 67845, 189493, 520359, 1409742, 3778514, 10042552, 26517095, 69668495, 182357337, 476027280, 1240285036, 3227591882, 8393207561, 21819385961, 56722065995, 147485931154, 383621798278, 998279190044, 2599085844715, 6770473854147, 17646032160125
(列表;图表;参考;听;历史;文本;内部格式)
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