A303031 Number of unlabeled connected loopless multigraphs with n nodes of degree 5 or less and with single or double edges.

1, 1, 2, 7, 43, 282, 2708, 31175, 451701, 7731154, 154264825, 3515514725, 90381251065, 2594105950453, 82437061616923, 2880328250160638, 109987239823116870, 4566153786442575091, 205144850920195457266, 9933105076082553631262, 516439104253062357469829

Offset: 0

Author

Natan Arie Consigli, Jun 04 2018

Keywords

• nonn

Crossrefs

Cf. A289158, A303032, A303033.

Programs

nauty

for n in {1..11}; do geng -c -D5 ${n}  -q | multig -m2 -D5 -u; done

Extensions

a(12)-a(20) from Andrew Howroyd, Mar 20 2020