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1, 3, 6, 13, 26, 52, 104, 209, 418, 836, 1672, 3344, 6688, 13376, 26752, 53505, 107010, 214020, 428040, 856080, 1712160, 3424320, 6848640, 13697280, 27394560, 54789120, 109578240, 219156480, 438312960, 876625920, 1753251840, 3506503681, 7013007362
(列表;图表;参考;听;历史;文本;内部格式)
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