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 A267699 #5 Apr 02 2016 21:26:41 %S A267699 0,2,4,7,12,7,12,15,20,7,12,15,20,15,28,39,36,7,12,15,20,15,28,39,36, %T A267699 15 %N A267699 First differences of A267698. %C A267699 Number of Q-toothpicks added at n-th stage in the Q-toothpick structure of A267698. %H A267699 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 A267699 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %H A267699 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %e A267699 When the positive terms are written as an irregular triangle in which the row lengths are the terms of A011782 the sequence begins: %e A267699 2; %e A267699 4; %e A267699 7, 12; %e A267699 7, 12, 15, 20; %e A267699 7, 12, 15, 20, 15, 28, 39, 36; %e A267699 7, 12, 15, 20, 15, 28, 39, 36, 15,... %Y A267699 Cf. A011782, A187210, A187211, A267695, A267698. %K A267699 nonn,tabf,more %O A267699 0,2 %A A267699 _Omar E. Pol_, Apr 02 2016