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%I #10 Feb 24 2021 02:48:19
%S 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 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 9,9,63,27,27
%N a(n) = A173461(n+1)/4.
%H 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 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 Cf. A173459, A173460, A173461, A173462.
%K nonn,more
%O 1,1
%A _Omar E. Pol_, Feb 18 2010
%E More terms from _Jinyuan Wang_, Mar 02 2020
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