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1, 2, 6, 36, 270, 2520, 28560, 361200, 5481000, 88565400, 1654052400, 32885455680, 721400359680, 17024709461760, 429108154675200, 11721695953968000, 333806974560259200, 10358856500289897600, 331148326165228091520, 11429645706428485536000, 407641141014720316704000
(列表;图表;参考;听;历史;文本;内部格式)
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