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1, 1, 3, 13, 75, 540, 4670, 47110, 543130, 7044450, 101519250, 1609319250, 27830729850, 521397676800, 10519576867800, 227400111939000, 5243385642495000, 128458209887007000, 3332234177825553000, 91241046790816923000, 2629791992312269785000
(列表;图表;参考;听;历史;文本;内部格式)
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