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1, 1, 2, 4, 24, 56, 640, 1632, 30464, 81664, 2251008, 6241280, 238222336, 676506624, 34141233152, 98709925888, 6363055718400, 18655203885056, 1495281327013888, 4432984678858752, 432399526939590656, 1293646660855398400, 150872297033214984192
(列表;图表;参考;听;历史;文本;内部格式)
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