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1, 1, 1, 4, 8, 38, 206, 1200, 6824, 50912, 446752, 3828592, 38953680, 411358960, 4740541440, 57933236928, 759535226432, 10488778719488, 156933187370432, 2425018017191040, 40031753222399360, 689218695990369536, 12461424512466701312, 234386152841716303616
(列表;图表;参考文献;听;历史;文本;内部格式)
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