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 A360921 #6 Feb 16 2025 08:34:04 %S A360921 1,3,7,12,19,26,36,46,59,72,87,102,120,138,159 %N A360921 Maximum number of vertices in an induced tree in the n X n grid graph. %H A360921 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GridGraph.html">Grid Graph</a>. %F A360921 a(n) >= A331968(n). %e A360921 a(4) = 12: %e A360921 O O O O %e A360921 O O %e A360921 O O O %e A360921 O O O %Y A360921 Main diagonal of A360920. %Y A360921 Cf. A331968, A357357, A360919 (maximum induced trees). %K A360921 nonn,more %O A360921 1,2 %A A360921 _Andrew Howroyd_, Feb 26 2023