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
KEYWORD
nonn,hard
AUTHOR
Natan Arie Consigli, Aug 09 2019
EXTENSIONS
Terms a(13) and beyond from Andrew Howroyd, Mar 17 2020
STATUS
approved