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1, 2, 5, 16, 53, 179, 637, 2302, 8481, 31553, 118050, 445260, 1688727, 6438285, 24645509, 94629373, 364407934, 1406835343, 5443691793, 21106577597, 81977147966, 318895294012, 1242270865697, 4845566251183, 18922717069433, 73975062360180, 289475083120883
(列表;图表;参考;听;历史;文本;内部格式)
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