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1, 1, 2, 5, 16, 53, 194, 706, 2725, 10743, 42930, 176429, 736356, 3103055, 13254641, 57222484, 249217292, 1093491029, 4832787312, 21511601604, 96258301287, 432911365017, 1957187892005, 8886827390535, 40506590113021, 185330994400795, 850969255259770, 3919560505626379, 18105550077932420
(列表;图表;参考文献;听;历史;文本;内部格式)
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