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A219895 Number of directed 3-regular graphs on n nodes without directed 2-cycles. 1
3, 26, 1547, 146487, 16018987, 1985766270, 278601715904 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,1

LINKS

Table of n, a(n) for n=7..13.

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

CROSSREFS

Cf. A096368, A219889, A219890, A219891, A219892, A219893, A219894.

Sequence in context: A280222 A174811 A214808 * A088730 A058956 A010257

Adjacent sequences:  A219892 A219893 A219894 * A219896 A219897 A219898

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Nov 30 2012

STATUS

approved

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Last modified September 26 23:31 EDT 2020. Contains 337378 sequences. (Running on oeis4.)