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 A360868 #9 Mar 02 2023 11:24:46
%S A360868 0,1,4,23,172,1848,25684
%N A360868 Number of unlabeled connected loopless multigraphs with circuit rank n and degree >= 3 at each node.
%F A360868 a(n) = Sum_{k>=1} A360866(n + k - 1, k).
%Y A360868 Diagonal sums of A360866.
%Y A360868 Cf. A360864, A360867, A360879.
%K A360868 nonn,hard,more
%O A360868 1,3
%A A360868 _Andrew Howroyd_, Feb 25 2023