A129426 - OEIS

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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

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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