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1, 6, 20, 84, 296, 1124, 4056, 15100, 55288, 204740, 753336, 2782588, 10252952, 37831684, 139470616, 514443580, 1896954168, 6996160196, 25799583352, 95147186940, 350881763288, 1294007162500, 4772059430872, 17598637988284, 64900766401656, 239343741625668, 882659972822840, 3255107458681212, 12004301666699032
(列表;图表;参考文献;听;历史;文本;内部格式)
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