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1, 4, 20, 114, 750, 5616, 47304, 443400, 4582200, 51790320, 635791680, 8426915280, 119960552880, 1825701857280, 29585590473600, 508653914267520, 9248148480574080, 177303557272262400, 3574966680853747200, 75628468328518828800, 1675003757666567328000
(列表;图表;参考;听;历史;文本;内部格式)
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