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 A233763 #16 Dec 22 2013 00:04:24 %S A233763 0,1,2,2,4,2,4,5,8,2,4,6,12,6,8,11,16,2,4,6,12,14,16,18,24,10,8,14,28, %T A233763 14,16,23,32,2,4,6,12,14,16,20,32,24,20,22,40,30,40,39,48,18,8 %N A233763 Number of toothpicks or D-toothpicks added at n-th stage in the structure of the D-toothpick "narrow" triangle of A233762. %C A233763 Essentially the first differences of A233762. %H A233763 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 A233763 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %F A233763 a(2n) = A220523(2n); a(2n+1) = A220523(2n+1) - 2. %e A233763 Written as an irregular triangle in which the row lengths is A011782 the sequence (starting from 1) begins: %e A233763 1; %e A233763 2; %e A233763 2,4; %e A233763 2,4,5,8; %e A233763 2,4,6,12,6,8,11,16; %e A233763 2,4,6,12,14,16,18,24,10,8,14,28,14,16,23,32; %e A233763 2,4,6,12,14,16,20,32,24,20,22,40,30,40,39,48,18,8,... %e A233763 Right border gives A000079. %Y A233763 Cf. A000079, A011782, A139251, A220501, A220523, A233761, A233762. %K A233763 nonn,tabf,more %O A233763 0,3 %A A233763 _Omar E. Pol_, Dec 15 2013