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 A324494 #34 Oct 21 2019 02:33:27 %S A324494 1,10,10,20,50,30 %N A324494 Coordination sequence for Tübingen triangle tiling. %C A324494 Also known as the Tubingen or Tuebingen tiling. - _N. J. A. Sloane_, Jul 26 2019 %C A324494 The base point is taken to be the central point in the portion of the tiling shown in Baake et al. J. Phys. A (1997)'s Fig. 2 (left). %C A324494 Note that the points at distance 2 from the base point, taken in counterclockwise order starting at the x-axis, have degrees 8, 7, 6, 8, 7, 6, 7, 8, 6, 7, so the figure does not have cyclic 5-fold symmetry (even though the initial terms are multiples of 5). There is mirror symmetry about the x-axis. %C A324494 For another illustration of the central portion of the tiling, see Fig. 3 of the Baake 1997/2006 paper. - _N. J. A. Sloane_, Jul 26 2019 %D A324494 Baake, Michael. "Solution of the coincidence problem in dimensions d <= 4," in R. J. Moody, ed., The Mathematics of Long-Range Aperiodic Order, pp. 9-44, Kluwer, 1997 (First version) %H A324494 M. Baake, J. Hermisson, P. Pleasants, <a href="http://dx.doi.org/10.1088/0305-4470/30/9/016">The torus parametrization of quasiperiodic LI-classes</a>, J. Phys. A 30 (1997), no. 9, 3029-3056. See Fig. 2 (left). %H A324494 Michael Baake, <a href="http://arxiv.org/abs/math/0605222">Solution of the coincidence problem in dimensions d≤4</a>, arXiv:math/0605222 [math.MG], 2006. (Expanded version) %H A324494 N. J. A. Sloane, <a href="/A324494/a324494.png">Illustration of initial terms.</a> [Annotated version of Fig. 2 (left) of Baake et al. 1997.] %H A324494 <a href="/index/Con#coordination_sequences">Index entries for coordination sequences of aperiodic tilings</a> %Y A324494 Cf. A303981. %K A324494 nonn,more %O A324494 0,2 %A A324494 _N. J. A. Sloane_, Mar 12 2019