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1, 0, 273, 2600, 15574, 74152, 298727, 1063296, 3446976, 10372648, 29339830, 78743704, 202029217, 498419352, 1187801472, 2744629160, 6168518954, 13520236184, 28964224276, 60763815944, 125042509293, 252773942408, 502601223072, 984061445952, 1899179849814
(列表;图表;参考;听;历史;文本;内部格式)
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