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1, 2, 6, 20, 28, -936, -23672, -469456, -9112560, -182135008, -3804634784, -83297957568, -1906560847424, -45349267830400, -1110454747949952, -27582769902812416, -677408818380914432, -15581576995770441216, -284593895830642711040
(列表;图表;参考;听;历史;文本;内部格式)
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