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1, 1, 3, 6, 15, 31, 75, 164, 388, 887, 2092, 4884, 11599, 27443, 65509, 156427, 375263, 901353, 2171313, 5237581, 12658815, 30633725, 74238228, 180106656, 437437445, 1063425655, 2587564434, 6301175326, 15356071604, 37448674536
(列表;图表;参考;听;历史;文本;内部格式)
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