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0, 0, 2, 6, 18, 65, 295, 1652, 11032, 85353, 749203, 7347384, 79564496, 942541041, 12121319327, 168145213732, 2502276609008, 39761200642225, 671855234838915, 12028625060491336, 227451564319791336, 4529507975800063337, 94751047516476943359, 2077192015403191663844
(列表;图表;参考;听;历史;文本;内部格式)
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