A129426 Number of isomorphism classes of 8-regular loopless multigraphs of order n.

0, 1, 1, 10, 37, 582, 12511, 543779, 35255015, 3230979297, 397550237967, 63834143947661, 13080849749829233, 3358751856150607392, 1063851391062768324862, 410060430118305494628648, 190065946515113295597969794, 104826174445642584491349328181

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.

Formula

Euler transform of A129425. - Andrew Howroyd, Mar 17 2020

Crossrefs

Column k=8 of A333330.

Cf. A129425, A129437, A129416, A129418, A129420, A129422, A129424.

Sequence in context: A137280 A071261 A373619 * A215881 A279543 A065009

Adjacent sequences: A129423 A129424 A129425 * A129427 A129428 A129429

Keyword

nonn

Author

Brendan McKay, Apr 15 2007

Extensions

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

Status

approved