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 A160736 #10 Feb 24 2021 02:48:18 %S A160736 0,2,4,8,12,16,20,28,36,40,44,52,60,68,80,100,116,120,124,132,140,148, %T A160736 160,180,196,204,216,236,256,280,320,372,404,408,412,420,428,436,448, %U A160736 468,484,492,504,524,544,568 %N A160736 Toothpick sequence starting from a right angle formed by 2 toothpicks: a(n)=A160406(n)*2. %H A160736 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 A160736 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 A160736 Cf. A139250, A139251, A160737, A160738, A160740. %K A160736 nonn %O A160736 0,2 %A A160736 _Omar E. Pol_, May 25 2009 %E A160736 Terms after a(9) from _Nathaniel Johnston_, Mar 31 2011