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A170846 G.f.: Prod_{k >= 2} (1 + 3x^(2^k-1) + x^(2^k)). 0
1, 0, 0, 3, 1, 0, 0, 3, 1, 0, 9, 6, 1, 0, 0, 3, 1, 0, 9, 6, 1, 0, 9, 6, 1, 27, 27, 9, 1, 0, 0, 3, 1, 0, 9, 6, 1, 0, 9, 6, 1, 27, 27, 9, 1, 0, 9, 6, 1, 27, 27, 9, 1, 27, 27, 9, 82, 108, 54, 12, 1, 0, 0, 3, 1, 0, 9, 6, 1, 0, 9, 6, 1, 27, 27, 9, 1, 0, 9, 6, 1, 27, 27, 9, 1, 27, 27, 9, 82, 108, 54, 12, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..93.

David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, 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.]

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

CROSSREFS

Sequence in context: A107131 A027200 A035654 * A085604 A306268 A144357

Adjacent sequences:  A170843 A170844 A170845 * A170847 A170848 A170849

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 02 2010

STATUS

approved

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Last modified October 23 19:58 EDT 2019. Contains 328373 sequences. (Running on oeis4.)