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 A256536 #21 Jan 21 2016 16:38:05 %S A256536 1,4,9,18,27,36,53,78,95,104,121,150,187,220,261,318,351,360,377,406, %T A256536 443,480,533,618,703,752,793,866,967,1060,1161,1286,1351,1360,1377, %U A256536 1406,1443,1480,1533,1618,1703,1756,1809,1902,2035,2176,2325,2522,2703,2784,2825,2898,2999,3108,3249,3470,3723,3896,4013,4186,4435,4672,4909,5174,5303 %N A256536 Corner sequence associated with A151723. %C A256536 Total number of ON cells after n generations in one of the outside corners of an infinite hexagon-shaped structure on hexagonal grid. %C A256536 For an animation see "The movie version" in Links section. %C A256536 Partial sums of A256537. %C A256536 See also the Formula section in A256537. %C A256536 Compare A256138. %H A256536 David Applegate, <a href="/A139250/a139250.anim.html">The movie version</a> %H A256536 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 A256536 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %Y A256536 Cf. A151723, A153006, A169779, A256138, A256537. %K A256536 nonn %O A256536 1,2 %A A256536 _Omar E. Pol_, Apr 01 2015