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0, 2, 26, 274, 2844, 30708, 351504, 4292496, 55988640, 779171040, 11545476480, 181705299840, 3029581820160, 53376951801600, 991337037465600, 19363464423475200, 396915849843609600, 8520964324004966400, 191220598650009600000, 4477883953203763200000, 109242544826541772800000
(列表;图表;参考文献;听;历史;文本;内部格式)
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