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 A242128 #28 Jun 20 2019 17:50:34 %S A242128 5,10,15,15,30,25,30,50,40,40,50,60,60,75,75 %N A242128 Beginning with adding a central 'Star' configuration of a centrally symmetric Penrose rhomb tiling as the first step, number of tiles that can be added to the free edges of the current tiling. %H A242128 Felix Fröhlich, <a href="/A242128/a242128.pdf">Layers in the Penrose rhomb tiling with a "Star" patch as a center of global fivefold rotational symmetry</a>, 2019. %H A242128 Wikipedia, <a href="https://en.wikipedia.org/wiki/Penrose_tiling">Penrose tiling</a> %e A242128 See illustration in Fröhlich, 2019. %Y A242128 Cf. A242129 (5-fold, Sun), A242888 (7-fold, Star), A242889 (7-fold, Sun), A242890 (8-fold, Star), A242891 (8-fold, Sun), A242892 (9-fold, Star), A242893 (9-fold, Sun), A242894 (Kite and dart, Star), A242895 (Kite and dart, Sun). %K A242128 nonn,more %O A242128 1,1 %A A242128 _Felix Fröhlich_, May 05 2014 %E A242128 More terms from _Felix Fröhlich_, Jun 20 2019