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 A170885 #15 Feb 01 2023 12:28:49 %S A170885 0,3,4,8,12,12,12,16,32,56,68,40,20,16,32,56,80,88,104,152,256,376, %T A170885 388,164,64,24,40,56,80,88,104,152,256,376,424,296,256,272,416,552 %N A170885 First differences of A170884. %H A170885 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 A170885 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> %K A170885 nonn,more %O A170885 0,2 %A A170885 _David Applegate_, _Omar E. Pol_ and _N. J. A. Sloane_, Jan 09 2010 %E A170885 More terms from _Nathaniel Johnston_, Nov 13 2010