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 A360881 #5 Feb 25 2023 20:57:58 %S A360881 1,2,5,9,19,44,111,328,1090,3988,15838,67295,301417,1412821,6882398, %T A360881 34682721,180170661,962288228,5273162329 %N A360881 Number of unlabeled nonseparable (or 2-connected) multigraphs with n edges, loops allowed. %Y A360881 Row sums of A360880. %Y A360881 Cf. A007717, A007719, A010357. %K A360881 nonn,more %O A360881 1,2 %A A360881 _Andrew Howroyd_, Feb 25 2023