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1, 3, 7, 18, 48, 124, 324, 850, 2226, 5832, 15285, 40056, 104976, 275115, 721006, 1889568, 4952070, 12978093, 34012224, 89137244, 233605664, 612220032, 1604470381, 4204901942, 11019960576, 28880466845, 75688234943, 198359290368, 519848403194
(列表;图表;参考;听;历史;文本;内部格式)
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