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1, 1, 2, 6, 24, 114, 592, 3216, 17904, 101198, 578208, 3332136, 19343408, 113017332, 664168160, 3923729280, 23291913440, 138872375958, 831321465408, 4994806458040, 30111586314800, 182094123983660, 1104331746746208, 6715050373394528, 40931670125150624, 250065092876686924, 1530948705125205952, 9391164635349135184
(列表;图表;参考;听;历史;文本;内部格式)
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