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0, 2, 12, 120, 840, 6300, 44352, 312312, 2162160, 14877720, 101615800, 690617928, 4672781568, 31503417400, 211735414800, 1419325308000, 9492261518880, 63355075266780, 422102693073600, 2807792411008200, 18650635349346000, 123727184566025040, 819845328421788240
(列表;图表;参考文献;听;历史;文本;内部格式)
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