A129425 Number of isomorphism classes of connected 8-regular loopless multigraphs of order n.

0, 1, 1, 9, 36, 571, 12465, 543116, 35241608, 3230417239, 397514307014, 63830872225605, 13080448625309965, 3358687593761378470, 1063838242661288090062, 410057057694777406364151, 190064879184725871853627854, 104825763290631293396894238206

Offset: 1

Author

Brendan McKay, Apr 15 2007

Keywords

• nonn

Comments

Initial terms computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/

Links

• Brendan McKay and Adolfo Piperno, Nauty and Traces

Crossrefs

Column k=8 of A328682.

Cf. A129426, A129436, A000421, A129417, A129419, A129421, A129423, A328682.

Programs

nauty

geng -c -d1 ${n} -q | multig -r8 -u # Natan Arie Consigli, Jun 05 2017

Formula

Inverse Euler transform of A129426. - Andrew Howroyd, Mar 17 2020

Extensions

Deleted a(0) and a(1). - N. J. A. Sloane, Jan 11 2020

a(1)=0 prepended and a(12)-a(18) from Andrew Howroyd, Mar 17 2020