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 A299479 #18 Feb 04 2019 14:03:00 %S A299479 1,2,4,6,8,6,6,10,16,20,12,10,16,20,32,24,22,34,36,40,16,14,20,24,40, %T A299479 32,32,44,48,64,48,42,58,70,104,74,60,78,78,80,24,14,20,24,40,36,40, %U A299479 50,52,72 %N A299479 Number of toothpicks added at n-th stage to the structure of the cellular automaton of A299478. %C A299479 The "word" of this cellular automaton is abcbc. %C A299479 The associated sound to the animation of this cellular automaton could be [tick, tock, tack, tock, tack], [tick, tock, tack, tock, tack], and so on. %C A299479 For more information about the "word" of a cellular automaton see A296612. %H A299479 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 A299479 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %H A299479 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %e A299479 The structure of this irregular triangle is shown below: %e A299479 a, b, c, b, c; %e A299479 a, b, c, b, c; %e A299479 a, b, c, b, c, a, b, c, b, c; %e A299479 a, b, c, b, c, a, b, c, b, c, a, b, c, b, c, a, b, c, b, c; %e A299479 ... %e A299479 So, written as an irregular triangle in which the row lengths are the terms of A011782 multiplied by 5, the sequence begins: %e A299479 1, 2, 4, 6, 8; %e A299479 6, 6, 10, 16, 20; %e A299479 12, 10, 16, 20, 32, 24, 22, 34, 36, 40; %e A299479 16, 14, 20, 24, 40, 32, 32, 44, 48, 64, 48, 42, 58, 70, 104, 74, 60, 78, 78, 80; %e A299479 24, 14, 20, 24, 40, 36, 40, 50, 52, 72, ... %Y A299479 Cf. A299478. %Y A299479 Cf. A160121 (word "a"), A139251 (word "ab"), A296511 (word "abc"), A299477 (word "abcb"). %K A299479 nonn,tabf,more %O A299479 1,2 %A A299479 _Omar E. Pol_, Feb 11 2018