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1, 2, 8, 40, 212, 1152, 6360, 35520, 200132, 1135456, 6478088, 37128896, 213617704, 1233014720, 7136819376, 41408161920, 240758343684, 1402436532576, 8182797500328, 47814708577728, 279768031296312, 1638915078384960, 9611453035886160
(列表;图表;参考;听;历史;文本;内部格式)
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