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1, 2, 12, 60, 700, 3780, 51744, 288288, 4247100, 24066900, 369881512, 2118412296, 33466634656, 193076738400, 3109838832000, 18037065225600, 294718130342460, 1716299700229620, 28355714001615000, 165657066009435000, 2761067350729888200, 16171965911417916600
(列表;图表;参考;听;历史;文本;内部格式)
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