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 A170843 G.f.: Product_{k>=2} (1 + 2x^(2^k-1) + 3x^(2^k)). 0

%I #8 Feb 24 2021 02:48:19

%S 1,0,0,2,3,0,0,2,3,0,4,12,9,0,0,2,3,0,4,12,9,0,4,12,9,8,36,54,27,0,0,

%T 2,3,0,4,12,9,0,4,12,9,8,36,54,27,0,4,12,9,8,36,54,27,8,36,54,43,96,

%U 216,216,81,0,0,2,3,0,4,12,9,0,4,12,9,8,36,54,27,0,4,12,9,8,36,54,27,8,36,54,43

%N G.f.: Product_{k>=2} (1 + 2x^(2^k-1) + 3x^(2^k)).

%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 0,4

%A _N. J. A. Sloane_, Jan 02 2010

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Last modified May 28 22:21 EDT 2023. Contains 363028 sequences. (Running on oeis4.)