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1, 2, 6, 18, 47, 123, 324, 849, 2225, 5832, 15284, 40055, 104976, 275114, 721005, 1889568, 4952069, 12978092, 34012224, 89137243, 233605663, 612220032, 1604470380, 4204901941, 11019960576, 28880466844, 75688234942, 198359290368, 519848403193, 1362388228962
(列表;图表;参考;听;历史;文本;内部格式)
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