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 A105113 #5 Mar 12 2014 16:36:46 %S A105113 1,1,2,1,2,2,3,1,2,2,3,2,3,3,3,5,5,5,4,1,2,2,3,2,3,3,3,5,5,5,4,2,3,3, %T A105113 3,5,5,5,4,3,3,5,5,5,4,3,5,5,5,4,3,5,5,5,4,6,6,6,5,1,2,2,3,2,3,3,3,5, %U A105113 5,5,4,2,3,3,3,5,5,5,4,3,3,5,5,5,4,3,5,5,5,4,3,5,5,5,4,6,6,6,5,2,3,3,3,5,5 %N A105113 Triangle read by rows, based on the morphism f: 1->2, 2->3, 3->{3,5,5,5,4}, 4->5, 5->6, 6->{6,2,2,2,1}. First row is 1. If current row is a,b,c,..., then the next row is a,b,c,...,f(a),f(b),f(c),... %C A105113 This substitution with the polynomial that goes with it gives a new tile, not predicted in the Kenyon paper. %C A105113 q=3 version of bi-Kenyon 6-symbol substitution. %H A105113 Richard Kenyon, <a href="http://arXiv.org/abs/math.MG/9505210">The Construction of Self-Similar Tilings</a> %t A105113 s[n_] := n /. {1 -> 2, 2 -> 3, 3 -> {3, 5, 5, 5, 4}, 4 -> 5, 5 -> 6, 6 -> {6, 2, 2, 2, 1}}; t[a_] := Join[a, Flatten[s /@ a]] p[0] = {1}; p[1] = t[{1}]; Flatten[ NestList[t, {1}, 5]] %Y A105113 Cf. A103684, A105112, A105111. %K A105113 nonn,tabf %O A105113 0,3 %A A105113 _Roger L. Bagula_, Apr 07 2005