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 A233782 #11 Dec 22 2013 01:01:38 %S A233782 1,1,2,1,2,3,4,1,2,3,5,5,4,7,8,1,2,3,5,5,5,9,12,9,4,7,11,13,8,15,16,1, %T A233782 2,3,5,5,5,9,12,9,5,9,15,19,13,21,26,17,4,7,11,13,11,21,28,25,8,15,23, %U A233782 29,16,31,32,1,2,3,5,5,5,9,12,9,5,9,15,19 %N A233782 a(n) = A233781(n+1)/2. %C A233782 First 22 terms coincide with a(2)-a(23) of A169778. %H A233782 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 A233782 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %e A233782 Written as an irregular triangle in which the row lengths is A000079 the sequence begins: %e A233782 1; %e A233782 1,2; %e A233782 1,2,3,4; %e A233782 1,2,3,5,5,4,7,8; %e A233782 1,2,3,5,5,5,9,12,9,4,7,11,13,8,15,16; %e A233782 1,2,3,5,5,5,9,12,9,5,9,15,19,13,21,26,17,4,7,11,13,11,21,28,25,8,15,23,29,16,31,32; %Y A233782 Right border gives A000079. %Y A233782 Cf. A139251, A169778, A220501, A220521, A231351, A233781, A233780. %K A233782 nonn,tabf %O A233782 1,3 %A A233782 _Omar E. Pol_, Dec 17 2013