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2, 2, 5, 15, 52, 193, 765, 3143, 13323, 57670, 254040, 1134249, 5122124, 23349966, 107310784, 496633774, 2312539465, 10826481544, 50929829953, 240616214596, 1141195080020, 5431477088428, 25933525825389, 124185539096075, 596268057962349, 2869992942831031, 13845453533124431, 66934180769445444, 324218809545624984
(列表;图表;参考;听;历史;文本;内部格式)
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