OFFSET
0,3
COMMENTS
There are no (2n+1)-regular graphs satisfying the condition above.
Multigraphs are loopless.
Initial terms computed with 'nauty and Traces' (see the link).
LINKS
Brendan McKay and Adolfo Piperno, nauty and Traces
PROG
(nauty/shell) for ((n=0; n<30; n=n+2)); do geng -c -d1 7 -q | multig -r${n} -u; done
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Natan Arie Consigli, Apr 30 2019
EXTENSIONS
a(10)-a(20) from Andrew Howroyd, Mar 17 2020
STATUS
approved