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 A231349 #7 Dec 17 2013 09:22:06 %S A231349 1,2,4,4,4,8,10,8,4,8,12,16,10,20,22,16,4,8,12,16,12,24,28,32,10,20, %T A231349 28,40,22,44,46,32,4,8,12,16,12,24,28,32,12,24,32,48,28,56,60,64,10, %U A231349 20,28,40,28,56,64,80,22,44,60,88,46,92,94,64 %N A231349 Number of triangles added at n-th stage to the structure of A231348. %C A231349 First differences of A231348. %C A231349 Observation: the row sums of the first seven rows coincide with the first seven elements of A199923. %C A231349 Is A199923 the row sums of this triangle? %H A231349 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> %e A231349 Written as an irregular triangle in which row lengths is A011782 the sequence begins: %e A231349 1; %e A231349 2; %e A231349 4,4; %e A231349 4,8,10,8; %e A231349 4,8,12,16,10,20,22,16; %e A231349 4,8,12,16,12,24,28,32,10,20,28,40,22,44,46,32; %e A231349 4,8,12,16,12,24,28,32,12,24,32,48,28,56,60,64,10,20,28,40, 28,56,64,80,22,44,60,88,46,92,94,64; %Y A231349 Right border gives A000079. %Y A231349 Cf. A001316, A011782, A231348. %K A231349 nonn,tabf %O A231349 1,2 %A A231349 _Omar E. Pol_, Dec 15 2013