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0, 1, 2, 9, 44, 280, 2064, 17738, 172528, 1880856, 22686960, 300193872, 4323063744, 67323469200, 1127433161568, 20205636981840, 385897245967104, 7824675262660608, 167885148101916672, 3800289634376282496, 90513807325761507840, 2262830879094971399424
(列表;图表;参考文献;听;历史;文本;内部格式)
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