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1, 3, 12, 66, 484, 4536, 52128, 709776, 11153376, 198339840, 3932962560, 85976743680, 2053285148160, 53173906652160, 1483987541299200, 44396218792396800, 1417294759310438400, 48088097391133900800, 1728013936221838540800, 65558270633421791232000
(列表;图表;参考;听;历史;文本;内部格式)
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