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 A198515 #9 Aug 13 2020 14:02:28 %S A198515 1,3,11,16,22,31,30,35,39,43 %N A198515 Largest lifetime of any configuration starting from n cells which are king-wise connected for the cell automaton defined in A198514. %H A198515 Erich Friedman, <a href="https://erich-friedman.github.io/mathmagic/0902.html">Problem of the month September 2002</a> %e A198515 Solution for n=2 %e A198515 33 %e A198515 3123 %e A198515 3213 %e A198515 33 %Y A198515 Cf. A198514, A198516. %K A198515 nonn,more %O A198515 1,2 %A A198515 _Kausthub Gudipati_, Oct 26 2011