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0, 1, 3, 19, 91, 399, 1734, 7257, 29754, 120018, 477678, 1880898, 7339875, 28425538, 109368210, 418413378, 1592767290, 6036395895, 22786979315, 85714057229, 321381104832, 1201482684424, 4479736531496, 16661729383449, 61830609817953
(列表;图表;参考;听;历史;文本;内部格式)
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