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 A233765 #13 Dec 22 2013 00:04:01 %S A233765 0,1,2,2,4,2,4,6,8,2,4,6,10,10,8,14,16,2,4,6,10,10,10,18,24,18,8,14, %T A233765 22,26,16,30,32,2,4,6,10,10,10,18,24,18,10,18,28,38,30,50,54,34,8,14, %U A233765 22,26,22,42,56,50,16,30,46,58,32,62,64,2,4,6,10,10 %N A233765 Number of toothpicks or D-toothpicks added at n-th stage to the structure of the toothpick "wide" triangle of A233764. %C A233765 Essentially the first differences of A233764. %C A233765 First differs from A170905 at a(24). %C A233765 First differs from A233971 at a(25). %C A233765 First differs from A233781 at a(44). %H A233765 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 A233765 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %e A233765 Written as an irregular triangle in which the row lengths is A011782 the sequence (starting from 1) begins: %e A233765 1; %e A233765 2; %e A233765 2,4; %e A233765 2,4,6,8; %e A233765 2,4,6,10,10,8,14,16; %e A233765 2,4,6,10,10,10,18,24,18,8,14,22,26,16,30,32; %e A233765 2,4,6,10,10,10,18,24,18,10,18,28,38,30,50,54,34,8,14,22,26,22,42,56,50,16,30,46,58,32,62,64; %e A233765 Right border gives A000079. %Y A233765 Cf. A000079, A011782, A139251, A220501, A220521, A231349, A233764, A233781, A233971. %K A233765 nonn,tabf %O A233765 0,3 %A A233765 _Omar E. Pol_, Dec 16 2013