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1, 1, 4, 16, 88, 640, 5440, 54400, 620800, 7966720, 113651200, 1783091200, 30519808000, 565916876800, 11300689100800, 241781039104000, 5517822373888000, 133795711025152000, 3435107208822784000, 93093522064998400000, 2655675672405606400000, 79546285618254315520000
(列表;图表;参考;听;历史;文本;内部格式)
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