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 A173463 #10 Feb 24 2021 02:48:19 %S A173463 2,3,2,13,3,3,21,9,7,47,3,3,21,9,9,63,9,9,63,27,23,157,3,3,21,9,9,63, %T A173463 9,9,63,27,27,189,9,9,63,27,27,189,27,27,189,81,73,503,3,3,21,9,9,63, %U A173463 9,9,63,27,27 %N A173463 a(n) = A173461(n+1)/4. %H A173463 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 A173463 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 A173463 Cf. A173459, A173460, A173461, A173462. %K A173463 nonn,more %O A173463 1,1 %A A173463 _Omar E. Pol_, Feb 18 2010 %E A173463 More terms from _Jinyuan Wang_, Mar 02 2020