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 A159789 #10 Feb 24 2021 02:48:18 %S A159789 0,0,1,2,2,3,8,12,12,13,16,18,19,26,44,56,56,57,60,62,63,70,84,92,93, %T A159789 98,106,111,120,152,216,240,240,241,244,246,247,254,268,276,277,282, %U A159789 290,295,304,336,384,408,409,414 %N A159789 a(n) = A159786(n+1)/4. %H A159789 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 A159789 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 A159789 Toothpick sequence: A139250. %Y A159789 Cf. A139251, A153000, A159786, A159787, A159788, A159799. %K A159789 nonn %O A159789 0,4 %A A159789 _Omar E. Pol_, Apr 28 2009, May 02 2009 %E A159789 More terms from _Colin Barker_, Apr 19 2015