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1, 6, 35, 180, 921, 4626, 23215, 116160, 581141, 2906046, 14531595, 72659340, 363302161, 1816516266, 9082603175, 45413037720, 227065275981, 1135326467286, 5676632685955, 28383163779300, 141915820294601, 709579102871106, 3547895519947935, 17739477605332080, 88697388049030021
(列表;图表;参考;听;历史;文本;内部格式)
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