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A054928
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Complementary pairs of directed graphs on n nodes. Also unlabeled digraphs with n nodes and an even number of arcs.
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2
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1, 2, 10, 114, 4872, 770832, 441038832, 896679948304, 6513978501814144, 170630215981070456064, 16261454692532635025585792, 5683372715412701087902846672384, 7334542846356464937798016155801130496
(list; graph; refs; listen; history; internal format)
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