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 A159788 #9 Feb 24 2021 02:48:18 %S A159788 0,0,2,4,4,6,16,24,24,26,32,36,38,52,88,112,112,114,120,124,126,140, %T A159788 168,184,186,196,212,222,240,304,432,480,480,482,488,492,494,508,536, %U A159788 552,554,564,580,590,608,672,768,816,818,828 %N A159788 a(n) = A159786(n+1)/2. %H A159788 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 A159788 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 A159788 Toothpick sequence: A139250. %Y A159788 Cf. A139251, A152998, A159786, A159787, A159789, A159798. %K A159788 nonn %O A159788 0,3 %A A159788 _Omar E. Pol_, Apr 28 2009, May 02 2009 %E A159788 a(11)-a(49) from _Robert Price_, May 10 2019