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1, 1, 6, 58, 720, 10506, 172284, 3092717, 59758608, 1228626514, 26657057728, 606616602302, 14410894287172, 356081682054300, 9124705519233832, 241916247567814448, 6622686675121529288, 186900262172114801748, 5429779249015331564288, 162190080378495122207760
(列表;图表;参考;听;历史;文本;内部格式)
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