A219891 - OEIS

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A219891

Number of directed 4-regular graphs on n nodes.

7

1, 4, 92, 19041, 6510087, 2983458766, 1775668832509, 1349509467853512

(list; graph; refs; listen; history; text; internal format)

OFFSET

5,2

LINKS

Table of n, a(n) for n=5..12.

Gunnar Brinkmann, Generating regular directed graphs, Discrete Math., 313 (2012), 1-7.

CROSSREFS

Column k=4 of A350910.

Cf. A096368, A219889, A219890, A219892, A219893.

Sequence in context: A012135 A221287 A177411 * A050878 A173362 A353089

Adjacent sequences: A219888 A219889 A219890 * A219892 A219893 A219894

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Nov 30 2012

STATUS

approved