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1, 3, 9, 30, 117, 528, 2709, 15600, 99657, 699648, 5355009, 44382720, 396019197, 3785146368, 38583663309, 417826928640, 4790367838737, 57967904882688, 738337496799609, 9873907221135360, 138327377598038277, 2025896274960580608, 30959719452721035909, 492827536493909114880
(列表;图表;参考;听;历史;文本;内部格式)
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