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URL: https://oeis.org/A303031

⇱ A303031 - OEIS

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A303031
Number of unlabeled connected loopless multigraphs with n nodes of degree 5 or less and with single or double edges.
5
1, 1, 2, 7, 43, 282, 2708, 31175, 451701, 7731154, 154264825, 3515514725, 90381251065, 2594105950453, 82437061616923, 2880328250160638, 109987239823116870, 4566153786442575091, 205144850920195457266, 9933105076082553631262, 516439104253062357469829
OFFSET
0,3
PROG
(nauty) for n in {1..11}; do geng -c -D5 ${n} -q | multig -m2 -D5 -u; done
CROSSREFS
KEYWORD
nonn
AUTHOR
Natan Arie Consigli, Jun 04 2018
EXTENSIONS
a(12)-a(20) from Andrew Howroyd, Mar 20 2020
STATUS
approved