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1, 2, 7, 19, 54, 134, 354, 838, 2057, 4794, 11232, 25412, 58075, 128670, 286152, 625829, 1365653, 2941088, 6331146, 13474533, 28642325, 60404681, 127082128, 265712673, 554608226, 1151374963, 2385950536, 4924685252, 10145267212, 20831428273, 42708248451
(列表;图表;参考;听;历史;文本;内部格式)
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