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 A160159 #7 Feb 24 2021 02:48:18 %S A160159 2,2,4,8,8,4,8,12,8,8,16,24,20,12,20,20,8,8,16,24,20,16,28,32,24,32, %T A160159 56,68,52,40,52,36,8,8,16,24,20,16,28,32,24,32,56,68,52,44,60,48,24, %U A160159 32,56,68,56,60,88,88,80,120,180,188,144,128,132,68,8,8,16,24,20,16,28,32,24 %N A160159 First differences of A160158. %H A160159 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 A160159 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> %Y A160159 Cf. A139250, A139251, A160158, A160162, A160163. %K A160159 nonn %O A160159 1,1 %A A160159 _Omar E. Pol_, May 29 2009 %E A160159 Extended beyond a(13) by _R. J. Mathar_, Jun 01 2009