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 A151524 #9 Feb 16 2025 08:33:09 %S A151524 1,1,3,5,12,24,58,126,300,686,1630,3792,8983,21051,49776,116858, %T A151524 275789,647573,1525847,3580673,8424978,19755938,46426810 %N A151524 Number of 2-sided strip polyrhombs with n cells. %H A151524 Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/">Illustrations of polyforms</a> %H A151524 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Polyrhomb.html">Polyrhomb</a> %K A151524 nonn,hard,more %O A151524 1,3 %A A151524 _Ed Pegg Jr_, May 13 2009 %E A151524 a(15)-a(23) from _Joseph Myers_, Nov 22 2010