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1, 1, 0, 0, 12, 60, 240, 1680, 15120, 136080, 1330560, 14636160, 176299200, 2291889600, 32069157120, 481037356800, 7697116627200, 130850982662400, 2355300044697600, 44750700849254400, 895014687427660800, 18795308435980876800, 413496757432991232000
(列表;图表;参考;听;历史;文本;内部格式)
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