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1, 1, 2, 9, 48, 330, 2760, 26670, 295680, 3686760, 51080400, 778516200, 12944131200, 233156523600, 4522777459200, 94000269963600, 2083918752115200, 49086474041404800, 1224240044169542400, 32229413145084355200, 893129953569780326400, 25987602379142314310400, 792175050968260985625600
(列表;图表;参考;听;历史;文本;内部格式)
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