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 A151535 #10 Feb 16 2025 08:33:09 %S A151535 1,3,7,19,47,125,310,803,2020,5144,12986,32829,82728,208461,524092, %T A151535 1317284,3305350,8291010,20770830 %N A151535 Number of 1-sided strip polycairos with n cells. %H A151535 Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/">Illustrations of polyforms</a> %H A151535 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Polycairo.html">Polycairo</a> %Y A151535 Cf. A159866, A151534, A151536. %K A151535 nonn,hard,more %O A151535 1,2 %A A151535 _Ed Pegg Jr_, May 13 2009 %E A151535 a(13)-a(19) from _Joseph Myers_, Oct 03 2011