This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A303031 #14 Jun 02 2025 17:24:32
%S A303031 1,1,2,7,43,282,2708,31175,451701,7731154,154264825,3515514725,
%T A303031 90381251065,2594105950453,82437061616923,2880328250160638,
%U A303031 109987239823116870,4566153786442575091,205144850920195457266,9933105076082553631262,516439104253062357469829
%N A303031 Number of unlabeled connected loopless multigraphs with n nodes of degree 5 or less and with single or double edges.
%o A303031 (nauty) for n in {1..11}; do geng -c -D5 ${n} -q | multig -m2 -D5 -u; done
%Y A303031 Cf. A289158, A303032, A303033.
%K A303031 nonn
%O A303031 0,3
%A A303031 _Natan Arie Consigli_, Jun 04 2018
%E A303031 a(12)-a(20) from _Andrew Howroyd_, Mar 20 2020