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 A242895 #22 Oct 15 2020 21:21:30 %S A242895 5,5,10,15,20,25,30 %N A242895 Beginning with a central 'Sun' configuration of a Penrose 'Kite' and 'Dart' tiling with rotational symmetry as the first step, number of tiles that can be added to the free edges of the current tiling. %C A242895 The initial 5 corresponds to the "Sun" configuration made of 5 Penrose "Kites". In view of the 5-fold rotational symmetry, all terms are divisible by 5, see the illustrations given as LINKS. - _M. F. Hasler_, Jun 05 2019 %H A242895 Sam T. Benge(?), <a href="http://news.povray.org/povray.binaries.images/attachment/%3C4aeba15d@news.povray.org%3E/penrosedeflation15_27.jpg?ttop=359715&toff=450">Image of 'Sun' and 'Star' configurations in a centrally symmetric 'Kite' and 'Dart' tiling</a>, <a href="http://news.povray.org/povray.binaries.images/attachment/%3C4aeba15d@news.povray.org%3E">post to the POV-Ray Newsgroup</a>, Oct 31 2009. %H A242895 Wikipedia, <a href="https://en.wikipedia.org/wiki/Penrose_tiling#Deflation_for_P2_and_P3_tilings">Penrose tiling, Deflation for P2 and P3 tilings</a>. (Defines "sun" and "star" configurations and generations corresponding to terms of this sequence.) %Y A242895 Cf. A242128, A242129, A242888, A242889, A242890, A242891, A242892, A242893, A242894. %K A242895 nonn,more %O A242895 1,1 %A A242895 _Felix Fröhlich_, May 25 2014