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1, 1, 2, 4, 9, 18, 39, 81, 170, 355, 748, 1576, 3334, 7054, 14935, 31591, 66732, 140708, 296379, 624389, 1317807, 2790095, 5930254, 12652077, 27071714, 58019282, 124377335, 266404590, 569755992, 1216513200, 2593884456, 5526424017, 11773433242
(列表;图表;参考;听;历史;文本;内部格式)
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