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1, 1, 3, 9, 48, 240, 1620, 11340, 103320, 929880, 9865800, 108523800, 1362160800, 17708090400, 253361908800, 3800428632000, 63340477200000, 1076788112400000, 19769829743664000, 375626765129616000, 7640832869429760000, 160457490258024960000, 3559701523615997760000
(列表;图表;参考;听;历史;文本;内部格式)
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