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1, 6, 44, 360, 3152, 28896, 273856, 2661504, 26380544, 265655808, 2710244352, 27952883712, 290977271808, 3053105307648, 32256844087296, 342870535471104, 3664053076557824, 39342496410894336, 424243929700630528, 4592400943255388160, 49885822426526253056
(列表;图表;参考;听;历史;文本;内部格式)
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