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1, 1, 3, 8, 32, 110, 444, 1676, 7090, 28314, 121990, 504920, 2212372, 9382416, 41584876, 179539056, 803135830, 3514731918, 15837959224, 70054928916, 317581225854, 1416879893330, 6455464123356, 29006054220056, 132718076206868, 599896260799838, 2754895622501684, 12515550063373760, 57657852586593046
(列表;图表;参考;听;历史;文本;内部格式)
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