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0, 2, 12, 52, 168, 461, 1133, 2612, 5759, 12309, 25666, 52509, 105803, 210655, 415349, 812461, 1578752, 3050921, 5868562, 11244267, 21472441, 40887802, 77668032, 147222550, 278556477, 526215993, 992694708, 1870443330, 3520594166, 6620431857, 12439538938
(列表;图表;参考;听;历史;文本;内部格式)
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