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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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2
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1, 3, 13, 144, 5158, 778084, 441288796, 896699384640, 6513980949408584, 170630216624502796000, 16261454692830032538976880, 5683372715412978313604073582912, 7334542846356465411966209047539403296, 35157828307617499762304829312302735958971072, 629172630775224433640531447950565255471723325434560
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listen;
history;
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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A000273 = Cases[Import["https://oeis.org/A000273/b000273.txt", "Table"], {_, _}][[All, 2]];
A002499 = Cases[Import["https://oeis.org/A002499/b002499.txt", "Table"], {_, _}][[All, 2]];
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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