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1, 2, 3, 6, 9, 18, 36, 54, 81, 162, 324, 648, 1296, 1944, 2916, 4374, 6561, 13122, 26244, 52488, 104976, 209952, 419904, 839808, 1679616, 2519424, 3779136, 5668704, 8503056, 12754584, 19131876, 28697814, 43046721, 86093442, 172186884, 344373768, 688747536
(列表;图表;参考;听;历史;文本;内部格式)
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