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1, 0, 3, 6, 7, 20, 42, 72, 141, 280, 516, 976, 1853, 3420, 6361, 11844, 21819, 40192, 73942, 135452, 247828, 452776, 825252, 1501998, 2730159, 4954890, 8981360, 16261568, 29408708, 53130154, 95894384, 172917788, 311538169, 560831286
(列表;图表;参考;听;历史;文本;内部格式)
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