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1, 1, 2, 6, 21, 75, 268, 958, 3425, 12245, 43778, 156514, 559565, 2000543, 7152292, 25570698, 91419729, 326841561, 1168515890, 4177649198, 14935828405, 53398205443, 190907947468, 682529386598, 2440162233937, 8724007852045, 31189857766034, 111509210441322, 398664979703373
(列表;图表;参考;听;历史;文本;内部格式)
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