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 A297061 #8 Feb 16 2025 08:33:52 %S A297061 0,4,198,84682,281721996,7392711987818,1528658402287559670, %T A297061 2490983667363798650708788,31987702603596066902310936860946, %U A297061 3237032742135065575663156511653859260726,2581445727611992619431296420645395411748335733438 %N A297061 Number of edge covers in the n X n triangular grid graph. %H A297061 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/EdgeCover.html">Edge Cover</a> %H A297061 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TriangularGraph.html">Triangular Graph</a> %Y A297061 Cf. A269869. %K A297061 nonn %O A297061 0,2 %A A297061 _Eric W. Weisstein_, Dec 24 2017 %E A297061 a(5)-a(10) from _Andrew Howroyd_, Dec 27 2017