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

%I #11 Mar 20 2020 15:09:57

%S 1,1,2,7,43,282,2708,31175,451701,7731154,154264825,3515514725,

%T 90381251065,2594105950453,82437061616923,2880328250160638,

%U 109987239823116870,4566153786442575091,205144850920195457266,9933105076082553631262,516439104253062357469829

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

%o (nauty/shell) for n in {1..11}; do geng -c -D5 ${n} -q | multig -m2 -D5 -u; done

%Y Cf. A289158, A303032, A303033.

%K nonn

%O 0,3

%A _Natan Arie Consigli_, Jun 04 2018

%E a(12)-a(20) from _Andrew Howroyd_, Mar 20 2020