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1, 0, 0, 6, 12, 20, 2550, 20202, 105896, 6501672, 111489930, 1203491630, 53987127612, 1496864088876, 27032265220142, 1088916434686290, 40758246253626960, 1081683296597292752, 44159293393817257746, 1998309768008640244182, 71124972575776526592740
(列表;图表;参考;听;历史;文本;内部格式)
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