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1, 1, 2, 6, 23, 103, 515, 2803, 16334, 100700, 650905, 4380595, 30528410, 219352058, 1619260140, 12245357074, 94636062782, 745907086918, 5985448211508, 48824435255942, 404330087326924, 3395418226577756, 28884708430087203, 248696210256230427
(列表;图表;参考;听;历史;文本;内部格式)
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