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A219891
Number of directed 4-regular graphs on n nodes.
7
1, 4, 92, 19041, 6510087, 2983458766, 1775668832509, 1349509467853512
OFFSET
5,2
LINKS
Gunnar Brinkmann, Generating regular directed graphs, Discrete Math., 313 (2012), 1-7.
CROSSREFS
Column k=4 of A350910.
Sequence in context: A012135 A221287 A177411 * A050878 A173362 A353089
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Nov 30 2012
STATUS
approved