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1, 0, 2, 6, 12, 240, 480, 12600, 62160, 665280, 10009440, 94802400, 1497545280, 23662679040, 317854817280, 5236146115200, 102522189369600, 1772579589580800, 39459091697625600, 809304973699622400, 17463916757211724800, 388537548150495744000
(列表;图表;参考;听;历史;文本;内部格式)
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