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 A243884 #26 Jun 17 2019 01:54:24 %S A243884 1,2,1,2,3,1,2,4,1,2,1,2,3,1,2,1,4,2,1,3,2,1,2,1,2,3,1,2,4,1,2,1,3,2, %T A243884 1,2,1,2,3,1,2,4,1,2,1,2,3,1,2,1,4,2,1,3,2,1,2,1,2,3 %N A243884 Type of walk that occurs when walking along a ray emanating from the center of a rotationally symmetric Penrose rhomb tiling with a "Sun" patch at the center (see comments for details). %C A243884 The ray starts at the center of the tiling and goes through the center of one of the thick rhombs of the central "Sun" patch. The walk types that can occur are encoded as follows: %C A243884 Walk type | Number %C A243884 --------------------------------------- %C A243884 along diagonal of thick rhomb | 1 %C A243884 along edge of thick rhomb | 2 %C A243884 along diagonal of thin rhomb | 3 %C A243884 along edge of thin rhomb | 4 %H A243884 Felix Fröhlich, <a href="/A243884/a243884.pdf">Ray emanating from the center of a Penrose rhomb tiling with a "Sun" patch at the center</a>, 2019. %H A243884 Wikipedia, <a href="https://en.wikipedia.org/wiki/Penrose_tiling">Penrose tiling</a> %e A243884 See illustration in Fröhlich, 2019. %Y A243884 Cf. A242129. %K A243884 nonn,more %O A243884 1,2 %A A243884 _Felix Fröhlich_, Jun 13 2014 %E A243884 More terms, new name and editing from _Felix Fröhlich_, Jun 16 2019