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3, 7, 19, 57, 169, 505, 1515, 4543, 13627, 40881, 122641, 367921, 1103763, 3311287, 9933859, 29801577, 89404729, 268214185, 804642555, 2413927663, 7241782987, 21725348961, 65176046881, 195528140641, 586584421923, 1759753265767
(列表;图表;参考;听;历史;文本;内部格式)
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