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 A242892 #11 Jun 18 2014 11:53:47 %S A242892 9,9,18,27,27,18 %N A242892 Beginning with a centrally symmetric 'Star' configuration of 9 rhombi with rotational symmetry, number of tiles that can be added to the free edges of the tiling. %H A242892 S. Weber, <a href="http://www.jcrystal.com/steffenweber/JAVA/jtiling/jtiling.html">Fourier transform on quasiperiodic point sets</a> (select '9-fold' with 'shift (n-1)/(2n)') %Y A242892 Cf. A242128, A242129, A242888, A242889, A242890, A242891, A242893, A242894, A242895. %K A242892 nonn,more %O A242892 1,1 %A A242892 _Felix Fröhlich_, May 25 2014