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 A151530 #9 Feb 16 2025 08:33:09 %S A151530 1,2,3,7,14,31,63,141,297,649,1391,3026,6539,14187,30619,66172,142667, %T A151530 307883,663506,1429816,3077752,6622351 %N A151530 Number of 2-sided strip polykites with n cells. %H A151530 Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/">Illustrations of polyforms</a> %H A151530 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Polykite.html">Polykite</a> %K A151530 nonn,hard,more %O A151530 1,2 %A A151530 _Ed Pegg Jr_, May 13 2009 %E A151530 a(15)-a(22) from _Joseph Myers_, Nov 28 2010