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1, 2, 9, 40, 385, 4536, 66409, 1127792, 21981537, 483858640, 11873508361, 321497975448, 9522483900241, 306292854886760, 10632656242583145, 396223803663328096, 15776491521834720961, 668460175137505993248, 30030668624358362706697, 1425868954034374729854920
(列表;图表;参考;听;历史;文本;内部格式)
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