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 A173066 #9 Feb 24 2021 02:48:19 %S A173066 0,0,0,0,0,0,0,6,0,0,0,6,0,6,6,36,12,12,12,18,12,18,18,48,24,30,30,60, %T A173066 36,60,72,198,120,108,108,114,108,114,114,144,120,126,126,156,132,156, %U A173066 168,294,216,210,210 %N A173066 a(n) = A130665(n-1) - A160120(n). %H A173066 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 A173066 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 A173066 Cf. A130665, A139250, A160120, A160715, A173067, A173068, A173451, A173452, A173453. %K A173066 nonn %O A173066 1,8 %A A173066 _Omar E. Pol_, May 29 2010 %E A173066 More terms from _Nathaniel Johnston_, Nov 15 2010