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1, 1, 9, 54, 482, 4239, 55561, 785554, 14133055, 285547760, 6666380256, 172748192767, 4974178683908, 156462697434990, 5354832107694444, 197710292330150160, 7839473395324929677, 332071887435037103895, 14968498613432649146050, 715294449027151380463781
(列表;图表;参考;听;历史;文本;内部格式)
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