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1, 3, 12, 46, 120, 597, 2035, 6554, 28560, 86158, 341525, 1315911, 3455641, 17021162, 58317492, 186118929, 815616479, 2474152797, 9719139348, 37641223154, 99498527400, 485257533003, 1671083125805, 5284814079046, 23290743888720, 71041880304722, 276564805068235
(列表;图表;参考;听;历史;文本;内部格式)
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