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

4,2

LINKS

Table of n, a(n) for n=4..13.

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

CROSSREFS

Column k=3 of A350910.

Cf. A096368, A219889, A219890, A219891, A219892, A219893.

Sequence in context: A266923 A060941 A338178 * A119774 A074649 A233211

Adjacent sequences: A219887 A219888 A219889 * A219891 A219892 A219893

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Nov 30 2012

STATUS

approved

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Last modified December 6 21:00 EST 2022. Contains 358648 sequences. (Running on oeis4.)