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 A387568 #4 Sep 02 2025 09:26:02 %S A387568 2,10,934,15747098 %N A387568 Number of matchings in the n-Pell graph. %H A387568 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IndependentEdgeSet.html">Independent Edge Set</a>. %H A387568 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PellGraph.html">Pell Graph</a>. %K A387568 nonn,more,new %O A387568 1,1 %A A387568 _Eric W. Weisstein_, Sep 02 2025