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1, 1, 2, 4, 14, 36, 320, 1328, 7872, 51552, 756480, 5440752, 68999136, 584117952, 9632932800, 152699071104, 1881048314880, 21977611223040, 343998708042240, 4374197540536320, 77078374650869760, 1646804888482037760, 45052372505959096320, 727420047420178022400
(列表;图表;参考;听;历史;文本;内部格式)
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