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1, 1, 3, 10, 40, 155, 661, 2809, 12388, 55098, 249064, 1135248, 5225124, 24208799, 112873953, 528935624, 2489987847, 11767157943, 55803419262, 265442664895, 1266114276385, 6053949599553, 29011329072416, 139305020533736, 670130501757298, 3229062672948896, 15583269734938239, 75310011395231900
(列表;图表;参考;听;历史;文本;内部格式)
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