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 A225355 #7 May 15 2013 17:26:21 %S A225355 0,1,2,4,4,4,7,12,8,4,8,16,16,20,21,28,16,4,8,16,24,28,36,44,34,28,24, %T A225355 44,44,52,49,60,32,4,8,16,24,28,38 %N A225355 a(n) = A221565(n)/4. %H A225355 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 A225355 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %e A225355 When written as a irregular triangle begins: %e A225355 0; %e A225355 1; %e A225355 2; %e A225355 4,4; %e A225355 4,7,12,8; %e A225355 4,8,16,16,20,21,28,16; %e A225355 4,8,16,24,28,36,44,34,28,24,44,44,52,49,60,32; %e A225355 4,8,16,24,28,38... %Y A225355 Row lengths give 1 together with A011782. Right border gives 0 together with A000079. %Y A225355 Cf. A139251, A182635, A221565. %K A225355 nonn,tabf,more %O A225355 0,3 %A A225355 _Omar E. Pol_, May 13 2013