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1, 1, 1, 4, 9, 28, 86, 265, 855, 2783, 9214, 30867, 104481, 356859, 1228064, 4254760, 14827717, 51944178, 182819043, 646128479, 2292209747, 8159722774, 29137365046, 104343145880, 374640974686, 1348388811894, 4863897209014, 17581361532197, 63673157211566
(列表;图表;参考;听;历史;文本;内部格式)
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