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1, 1, 2, 6, 30, 150, 900, 6300, 52920, 516600, 5166000, 56826000, 689396400, 9135126000, 127891764000, 1918376460000, 32083427376000, 547888316976000, 9941031356256000, 188879595768864000, 3817981890122400000, 80266319244951840000, 1769328161437636800000
(列表;图表;参考;听;历史;文本;内部格式)
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