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1, 1, 2, 4, 11, 20, 51, 100, 218, 441, 935, 1862, 3863, 7751, 15742, 31648, 63939, 128180, 257963, 516974, 1037502, 2078417, 4165647, 8339900, 16702136, 33428943, 66911942, 133891584, 267921227, 536021340, 1072395555, 2145272320, 4291440670, 8584166169, 17170641321, 34344672290, 68695318919, 137399603159, 274814652766
(列表;图表;参考文献;听;历史;文本;内部格式)
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