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1, 1, 7, 28, 143, 701, 3580, 18376, 95471, 499231, 2626607, 13883904, 73681316, 392323868, 2094932728, 11214085328, 60157698287, 323325959395, 1740682221829, 9385343934124, 50671846382743, 273913020523933, 1482311190765896, 8029798017622048, 43538300361416708
(列表;图表;参考文献;听;历史;文本;内部格式)
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