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%I #14 Feb 24 2021 02:48:18
%S 0,1,3,3,3,9,3,9,9,9,15,9,15,21,3,9,9,15,27,15,39,21,27,39,21,33,39,9,
%T 21,21,27,45,33,63,45,45,51,33,39,45,45,45,27,33,57,39,63,63,51,51,69,
%U 51,81,51,57,81,63,81,57,51,51,63,93,93,75,69,63
%N a(n) = A161331(n)/2.
%C Number of E-toothpicks added at n-th stage to the structure of A161334. - _Omar E. Pol_, Jan 07 2014
%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="/A161330/a161330.jpg">A single E-toothpick</a> รง
%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. A161330, A161331, A161334.
%K nonn
%O 0,3
%A _Omar E. Pol_, Jun 07 2009
%E More terms from _Omar E. Pol_, Jan 07 2014
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