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 A267701 #11 Jan 23 2016 16:23:45 %S A267701 0,0,0,0,0,0,0,0,1,0,0,0,1,0,1,1,4,0,0,0,1,0,0,1,4,0,1,1,5,2,4,4,13,2, %T A267701 0,0,1,0,1,1,4,0,1,1,5,2,4,4,13,2,1,1,5,2,5,6,16,5,4,4,15,8,13,15,38, %U A267701 10,0,0,1,0,1 %N A267701 a(n) = (A160121(n) - A266533(n))/6. %C A267701 a(n) is 1/6 of the difference between the number of Y-toothpicks added at n-th stage in the structure of A160120 and the number of Y-toothpicks added at n-th stage stage in the structure of A266532 (the outward version of A160120). %H A267701 N. J. A. Sloane, <a href="/wiki/Catalog_of_Toothpick_and_CA_Sequences_in_OEIS">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a> %H A267701 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %H A267701 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %e A267701 Written as an irregular triangle in which the row lengths are the terms of A011782 the sequence begins: %e A267701 0; %e A267701 0; %e A267701 0, 0; %e A267701 0, 0,0,0; %e A267701 1, 0,0,0,1,0,1,1; %e A267701 4, 0,0,0,1,0,0,1,4,0,1,1,5,2,4,4; %e A267701 13, 2,0,0,1,0,1,1,4,0,1,1,5,2,4,4,13,2,1,1,5,2,5,6,16,5,4,4,15,8,13,15; %e A267701 38,10,0,0,1,0,1... %Y A267701 Cf. A011782, A038573, A160120, A160121, A266532, A266533. %K A267701 nonn,tabf,more %O A267701 1,17 %A A267701 _Omar E. Pol_, Jan 19 2016