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1, 3, 21, 210, 2485, 31878, 427350, 5891028, 82824885, 1181976510, 17067482146, 248817506028, 3656231188246, 54086245380300, 804670817838300, 12030722583033960, 180648817921816245, 2722858996178147310, 41179040361190612650, 624643836563467851900
(列表;图表;参考;听;历史;文本;内部格式)
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