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0, 1, 4, 15, 50, 161, 504, 1555, 4750, 14421, 43604, 131495, 395850, 1190281, 3576304, 10739835, 32241350, 96767741, 290390604, 871346575, 2614389250, 7843866801, 23532998504, 70601791715, 211810967550, 635444087461, 1906354632004, 5719108635255, 17157415384250
(列表;图表;参考文献;听;历史;文本;内部格式)
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