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1, 2, 4, 11, 28, 68, 169, 422, 1048, 2603, 6472, 16088, 39985, 99386, 247036, 614027, 1526212, 3793532, 9429145, 23436926, 58254448, 144796331, 359903440, 894570224, 2223529441, 5526769202, 13737249076, 34145086475, 84870480556
(列表;图表;参考文献;听;历史;文本;内部格式)
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