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0, 0, 1, 6, 30, 140, 663, 3186, 15642, 78441, 400842, 2084698, 11009358, 58955139, 319619706, 1752122667, 9700923252, 54194387085, 305216395077, 1731579241287, 9889280682948, 56822058078669, 328300135291659, 1906449141877331, 11122447670117451, 65168427936552522
(列表;图表;参考;听;历史;文本;内部格式)
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