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A054950
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Number of labeled semi-strong digraphs on n nodes with an even number of components.
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0
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0, 1, 3, 76, 8220, 3418216, 5156362008, 28205998918336, 571801003320734400, 44006976469834509225856, 13095012982298536065778624128, 15245644966564725709168192019570176, 69953982671396722666217758540260522923520, 1270721533437616701720124856867026526491583190016
(list; graph; refs; listen; history; internal format)
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