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1, 2, 6, 30, 216, 1930, 20400, 251174, 3541888, 56226258, 991514880, 19230159982, 406873353216, 9326318738906, 230222431688704, 6089006394645750, 171780282479247360, 5149076226504182434, 163421449125050253312, 5474820500060681776574
(列表;图表;参考;听;历史;文本;内部格式)
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