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1, 1, 2, 4, 10, 50, 220, 1240, 6140, 32860, 602200, 5668400, 62030200, 522328600, 4487190800, 62591332000, 715163146000, 30496564010000, 482341877812000, 8342949421288000, 124613700640580000, 1733826182453140000, 36635355834463000000, 597186420007933040000
(列表;图表;参考;听;历史;文本;内部格式)
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