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%I #12 Feb 24 2021 02:48:18
%S 0,3,6,15,18,27,36,63,66,75,84,111,120,147,174,255,336,339
%N a(n) = A160714(n)*3.
%C The sequence gives the number of T-toothpicks in the structure after n rounds.
%C See A160172 and A160714 for more information about T-toothpick sequences.
%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. A139250, A160172, A160173, A160714, A160726.
%K nonn,more
%O 0,2
%A _Omar E. Pol_, Jun 02 2009
%E a(9)-a(17) from 3*A160714(n) by _Jinyuan Wang_, Mar 14 2020
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