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 A231351 #7 Dec 21 2013 04:15:59 %S A231351 1,2,2,2,4,5,4,2,4,6,8,5,10,11,8,2,4,6,8,6,12,14,16,5,10,14,20,11,22, %T A231351 23,16,2,4,6,8,6,12,14,16,6,12,16,24,14,28,30,32,5,10,14,20,14,28,32, %U A231351 40,11,22,30,44,23,46,47,32,2,4,6,8,6,12,14,16 %N A231351 a(n) = A231349(n+1)/2. %C A231351 Observation: the row sums of the first six rows coincide with the first six elements of A006234. %C A231351 Is A006234 the row sums of this triangle? %H A231351 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 A231351 Written as an irregular triangle in which row lengths is A000079 the sequence begins: %e A231351 1; %e A231351 2,2; %e A231351 2,4,5,4; %e A231351 2,4,6,8,5,10,11,8; %e A231351 2,4,6,8,6,12,14,16,5,10,14,20,11,22,23,16; %e A231351 2,4,6,8,6,12,14,16,6,12,16,24,14,28,30,32,5,10,14,20,14,28,32,40,11,22,30,44,23,46,47,32; %Y A231351 Right border gives A000079. %Y A231351 Cf. A006234, A231348, A231349. %K A231351 nonn,tabf %O A231351 1,2 %A A231351 _Omar E. Pol_, Dec 17 2013