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1, 0, 1, 2, 0, 44, 0, 1224, 2688, 25920, 293760, 3628800, 25090560, 762048000, 3887170560, 62749209600, 1233908121600, 22616539545600, 321930878976000, 10717413809356800, 108951843667968000, 1982497256570880000, 50138292140310528000, 1408088823809310720000, 25175914255793258496000
(列表;图表;参考;听;历史;文本;内部格式)
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