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1, 1, 2, 4, 9, 20, 45, 97, 217, 476, 1043, 2256, 4890, 10540, 22695, 48614, 103856, 221103, 469738, 995299, 2104514, 4439410, 9345471, 19631897, 41162937, 86148416, 179987656, 375411910, 781773332, 1625473202, 3374684346, 6996168098, 14483902403, 29945326755
(列表;图表;参考;听;历史;文本;内部格式)
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