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A054933
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Number of unlabeled digraphs on n nodes up to reversing the arcs.
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1
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1, 3, 13, 144, 5158, 778084, 441288796, 896699384640, 6513980949408584, 170630216624502796000, 16261454692830032538976880, 5683372715412978313604073582912, 7334542846356465411966209047539403296, 35157828307617499762304829312302735958971072, 629172630775224433640531447950565255471723325434560
(list; graph; refs; listen; history; internal format)
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