A325474 - OEIS

A325474

Number of connected n-regular loopless multigraphs on eight unlabeled nodes.

0, 0, 1, 20, 204, 1689, 13303, 90614, 543116, 2842431, 13218770, 55233883, 210199115, 736166006, 2395665563, 7301022565, 20981692199, 57188601747, 148588072319, 369611918382, 883579452509, 2036672785494, 4539872512172, 9811474182969, 20605911433906, 42141179374995

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

COMMENTS

Multigraphs are loopless.

Initial terms computed using 'Nauty and Traces' (see the link).

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..30

Brendan McKay and Adolfo Piperno, Nauty and Traces

PROG

(nauty/shell) for ((n=0; n<11; n++)); do geng -c -d1 8 -q | multig -r${n} -u; done

CROSSREFS