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%I #6 Feb 24 2021 02:48:19
%S 1,0,3,6,3,6,21,24,3,6,21,24,21,60,111,78,3,6,21,24,21,60,111,78,21,
%T 60,111,114,183,402,489,240,3,6,21,24,21,60,111,78,21,60,111,114,183,
%U 402,489,240,21,60,111,114,183,402,489,276,183,402,561,708,1353,2184,1947,726,3
%N a(0) = 1, a(1) = 0; a(2^i + j) = 3a(j) + 2a(j + 1) for 0 <= j < 2^i.
%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>
%K nonn
%O 0,3
%A _N. J. A. Sloane_, Jan 02 2010
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