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A219890
Number of directed 3-regular graphs on n nodes.
8
1, 2, 23, 415, 19041, 1104045, 79818336, 6958257941, 720814138673, 87579097910309
OFFSET
4,2
LINKS
Gunnar Brinkmann, Generating regular directed graphs, Discrete Math., 313 (2012), 1-7.
CROSSREFS
Column k=3 of A350910.
Sequence in context: A266923 A060941 A338178 * A119774 A074649 A233211
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Nov 30 2012
STATUS
approved