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 A173452 #10 Feb 24 2021 02:48:19 %S A173452 0,0,0,0,0,0,0,6,0,0,0,6,-6,6,0,30,0,0,0,6,-6,6,0,30,-12,6,0,30 %N A173452 a(n) = A048883(n-1) - A151710(n). %C A173452 It appears that the absolute value of a(n) is a multiple of 6, see A008588. - _Omar E. Pol_, Dec 06 2013 %H A173452 David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="/A000695/a000695_1.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.] %H A173452 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 A173452 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a> %e A173452 From _Omar E. Pol_, Dec 06 2013: (Start) %e A173452 Written as an irregular triangle in which row lengths is A011782 the sequence begins: %e A173452 0; %e A173452 0; %e A173452 0, 0; %e A173452 0, 0, 0, 6; %e A173452 0, 0, 0, 6, -6, 6, 0, 30; %e A173452 0, 0, 0, 6, -6, 6, 0, 30, -12, 6, 0, 30... %e A173452 (End) %Y A173452 Cf. A048883, A139250, A139251, A160121, A151710, A173066, A173067, A173068, A173451, A173453. %K A173452 more,sign,tabf %O A173452 1,8 %A A173452 _Omar E. Pol_, May 29 2010