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1, 1, 3, 12, 55, 276, 1477, 8296, 48393, 291010, 1794320, 11297760, 72413640, 471309944, 3108745785, 20746732688, 139899430981, 952127880138, 6533934575018, 45175430719240, 314467004704818, 2202576030828096, 15514620388706488, 109851319423632192, 781531332298053400
(列表;图表;参考;听;历史;文本;内部格式)
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