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1, 1, 2, 4, 12, 37, 162, 738, 3928, 22436, 138716, 911529, 6339770, 46336941, 354453138, 2826472249, 23423053967, 201179882629, 1786791372857, 16377359709120, 154644691266520, 1502016160624186, 14985219655673207, 153377735526218010, 1608741204839374373
(列表;图表;参考;听;历史;文本;内部格式)
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