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1, 1, 2, 6, 36, 240, 2040, 21000, 235200, 3265920, 47628000, 795175920, 14411295360, 279281882880, 6049083680640, 135398783520000, 3367873821312000, 87219462185856000, 2403098895060864000, 70681813184753971200, 2138850761148310809600
(列表;图表;参考;听;历史;文本;内部格式)
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