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1, 1, 3, 8, 26, 84, 315, 1155, 4479, 17879, 72237, 298920, 1254329, 5323120, 22882116, 99271167, 434160320, 1915240840, 8499435683, 37968001495, 170538467281, 769755420661, 3491044143734, 15897506282629, 72677164291744, 333440276296060, 1534802275386455, 7086364716511872, 32811176928714466
(列表;图表;参考;听;历史;文本;内部格式)
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