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0, 0, 2, -6, 18, -60, 214, -714, 984, 23040, -468880, 7113040, -102747560, 1501609200, -22698373400, 358125772200, -5919450952000, 102619545932800, -1865622384074400, 35539903321740000, -708618759088892000, 14768814409403208000
(列表;图表;参考;听;历史;文本;内部格式)
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