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 A302176 #41 Aug 08 2025 05:53:26 %S A302176 1,5,5,20,15,25,20,45,35,50,45,45,55,75,60,65,65,100,80,105,95,85,95, %T A302176 130,115,135,120,105,135,160,135,125,145,185,160,190,165,145,180,215, %U A302176 185,165,185,240,205,245,220,185,215,270,240,275,245,205,255 %N A302176 Coordination sequence for a node in a Penrose tiling with 5-fold symmetry. %C A302176 Note that this is not THE Penrose tiling, but a variant. See Klee link. - _N. J. A. Sloane_, Jan 07 2020 %H A302176 Bradley Klee, <a href="/A302176/b302176.txt">Table of n, a(n) for n = 0..100</a> %H A302176 Bradley Klee, <a href="https://community.wolfram.com/groups/-/m/t/1854034">Fixing RegionMember & A302176 at once</a>, Wolfram Community, Jan 06 2019 %H A302176 Bradley Klee, <a href="/A302176/a302176_2.png">Illustration of initial terms (1)</a> (extracted from the Wolfram Community link) %H A302176 Bradley Klee, <a href="/A302176/a302176_3.png">Illustration of initial terms (2)</a> (extracted from the Wolfram Community link) %H A302176 Anton Shutov and Andrey Maleev, <a href="https://doi.org/10.1107/S2053273318000062">Coordination numbers of the vertex graph of a Penrose tiling</a>, Acta Cryst. (2018). A74, 112-122. %H A302176 Anton Shutov and Andrey Maleev, <a href="/A302176/a302176_1.png">Coordination numbers of the vertex graph of a Penrose tiling</a>, Acta Cryst. (2018). A74, 112-122. [Annotated copy of Fig. 1, to illustrate initial terms of the sequence; with permission.] %H A302176 <a href="/index/Con#coordination_sequences">Index entries for coordination sequences of aperiodic tilings</a> %t A302176 (* See Klee link. *) %Y A302176 Cf. A302177, A302841, A302842. %K A302176 nonn %O A302176 0,2 %A A302176 _N. J. A. Sloane_, Apr 03 2018 %E A302176 More terms from _Bradley Klee_, Jan 09 2020