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 A242888 #10 Jun 23 2019 17:47:03 %S A242888 7,14,21,14,14,28 %N A242888 Beginning with adding a central 'Star' 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 A242888 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 (n-1)/2n') %Y A242888 Cf. A242128, A242129, A242889. %K A242888 nonn,more %O A242888 1,1 %A A242888 _Felix Fröhlich_, May 25 2014