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 A151536 #9 Feb 16 2025 08:33:09 %S A151536 1,2,4,10,25,64,158,405,1018,2580,6512,16435,41411,104280,262161, %T A151536 658763,1652954,4145802,10386103 %N A151536 Number of 2-sided strip polycairos with n cells. %H A151536 Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/">Illustrations of polyforms</a> %H A151536 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Polycairo.html">Polycairo</a> %Y A151536 Cf. A159866, A151534, A151535. %K A151536 nonn,hard,more %O A151536 1,2 %A A151536 _Ed Pegg Jr_, May 13 2009 %E A151536 a(13)-a(19) from _Joseph Myers_, Oct 03 2011