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A129425 Number of isomorphism classes of connected 8-regular loopless multigraphs of order n. 9
0, 1, 1, 9, 36, 571, 12465, 543116, 35241608, 3230417239, 397514307014, 63830872225605, 13080448625309965, 3358687593761378470, 1063838242661288090062, 410057057694777406364151, 190064879184725871853627854, 104825763290631293396894238206 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

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

LINKS

Table of n, a(n) for n=1..18.

Brendan McKay and Adolfo Piperno, Nauty and Traces

FORMULA

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

PROG

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

CROSSREFS

Column k=8 of A328682.

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

Sequence in context: A204513 A223306 A272890 * A246757 A079655 A203764

Adjacent sequences:  A129422 A129423 A129424 * A129426 A129427 A129428

KEYWORD

nonn

AUTHOR

Brendan McKay, Apr 15 2007

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

STATUS

approved

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Last modified May 28 18:24 EDT 2022. Contains 354122 sequences. (Running on oeis4.)