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 A324061 #25 Feb 01 2025 23:17:56 %S A324061 0,0,0,2,10,76,682,9864,245518,11366961 %N A324061 Number of simple connected graphs on n unlabeled nodes with radius 2. %H A324061 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GraphRadius.html">Graph Radius</a>. %H A324061 Wikipedia, <a href="https://en.wikipedia.org/wiki/Distance_(graph_theory)">Distance (graph theory)</a>. %Y A324061 Column k=2 of A324239. %K A324061 nonn,more %O A324061 1,4 %A A324061 _Andrew Howroyd_, Sep 03 2019