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1, 2, 6, 18, 64, 220, 888, 3192, 15104, 48096, 338400, 285120, 13728768, -75484032, 1327431168, -15621137280, 232048220160, -3468200017920, 56208508250112, -959557688285184, 17344153658234880, -330228975428997120, 6611419866845122560, -138844103855232061440
(列表;图表;参考;听;历史;文本;内部格式)
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