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1, 1, 2, 8, 30, 156, 900, 6192, 47904, 422928, 4138848, 44864640, 531227520, 6836927040, 94891046400, 1413494219520, 22481104677120, 380261238681600, 6814832064422400, 128991143627965440, 2571187988206540800, 53834676521793638400, 1181214133296983654400
(列表;图表;参考;听;历史;文本;内部格式)
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