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 A173462 #10 Feb 24 2021 02:48:19 %S A173462 4,6,4,26,6,6,42,18,14,94,6,6,42,18,18,126,18,18,126,54,46,314,6,6,42, %T A173462 18,18,126,18,18,126,54,54,378,18,18,126,54,54,378,54,54,378,162,146, %U A173462 1006,6,6,42,18,18,126,18,18,126,54,54 %N A173462 a(n) = A173461(n+1)/2. %H A173462 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 A173462 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 A173462 Cf. A173458, A173460, A173461, A173463. %K A173462 nonn,more %O A173462 1,1 %A A173462 _Omar E. Pol_, Feb 18 2010 %E A173462 More terms from _Jinyuan Wang_, Mar 02 2020