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0, 2, 6, 16, 34, 76, 158, 336, 698, 1460, 3030, 6296, 13042, 27004, 55822, 115296, 237866, 490308, 1009734, 2077736, 4271970, 8776972, 18019966, 36972016, 75808154, 155344596, 318145718, 651204536, 1332235218, 2724122780, 5567550190
(列表;图表;参考;听;历史;文本;内部格式)
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