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1, 1, 4, 12, 45, 157, 584, 2155, 8110, 30587, 116326, 443984, 1702272, 6546563, 25252094, 97638658, 378351696, 1468876958, 5712276601, 22247635905, 86765271643, 338795469496, 1324374411164, 5182303804184, 20297243177269, 79564763550396, 312137086267106, 1225421059470049
(列表;图表;参考;听;历史;文本;内部格式)
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