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1, 2, 6, 18, 60, 208, 751, 2822, 10753, 42183, 166628, 670911, 2722417, 11173737, 46266435, 192810207, 810214354, 3419430626, 14528960377, 61978178651, 265684720397, 1143533836367, 4938837058092, 21413340878930, 93089864465941, 406053198070959, 1775468065034791, 7784233998403516
(列表;图表;参考文献;听;历史;文本;内部格式)
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