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0, 2, 4, 10, 20, 44, 88, 182, 364, 738, 1476, 2972, 5944, 11924, 23848, 47768, 95536, 191214, 382428, 765136, 1530272, 3061104, 6122208, 12245530, 24491060, 48984342, 97968684, 195941804, 391883608, 783776080, 1567552160, 3135122038, 6270244076
(列表;图表;参考;听;历史;文本;内部格式)
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