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 A242889 #13 Jun 07 2014 01:42:35 %S A242889 7,7,7,14,21,35,28,28,42,49,63,42,56 %N A242889 Beginning with adding a central 'Sun' configuration of a centrally symmetric rhomb tiling with 7-fold symmetry, number of tiles that can be added to the free edges of the tiling. %H A242889 S. Weber, <a href="http://www.jcrystal.com/steffenweber/JAVA/jtiling/jtiling.html">Fourier transform on quasiperiodic point sets</a> (select '7-fold' with 'shift 1/n') %Y A242889 Cf. A242128, A242129, A242888. %K A242889 nonn,more %O A242889 1,1 %A A242889 _Felix Fröhlich_, May 25 2014