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 A151534 #9 Feb 16 2025 08:33:09 %S A151534 1,3,8,31,103,401,1537,6157,24748,101291,417374,1735847,7261892, %T A151534 30561122,129215115 %N A151534 Number of 1-sided polycairos with n cells. %H A151534 Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/">Illustrations of polyforms</a> %H A151534 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Polycairo.html">Polycairo</a> %Y A151534 Cf. A159866, A151535, A151536 %K A151534 nonn,hard,more %O A151534 1,2 %A A151534 _Ed Pegg Jr_, May 13 2009 %E A151534 a(11)-a(15) from _Joseph Myers_, Oct 03 2011