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2, 2, 4, 6, 12, 20, 40, 68, 136, 232, 464, 792, 1584, 2704, 5408, 9232, 18464, 31520, 63040, 107616, 215232, 367424, 734848, 1254464, 2508928, 4283008, 8566016, 14623104, 29246208, 49926400, 99852800, 170459392, 340918784, 581984768, 1163969536, 1987020288
(列表;图表;参考文献;听;历史;文本;内部格式)
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