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1, 1, 1, 2, 4, 16, 64, 512, 3072, 30720, 368640, 2949120, 35389440, 566231040, 6794772480, 149484994560, 3587639869440, 100453916344320, 1607262661509120, 32145253230182400, 771486077524377600, 18515665860585062400, 444375980654041497600, 17775039226161659904000
(列表;图表;参考文献;听;历史;文本;内部格式)
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