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A170852 G.f.: Prod_{k >= 2} (1 + 3x^(2^k-1) + 3x^(2^k)). 2
1, 0, 0, 3, 3, 0, 0, 3, 3, 0, 9, 18, 9, 0, 0, 3, 3, 0, 9, 18, 9, 0, 9, 18, 9, 27, 81, 81, 27, 0, 0, 3, 3, 0, 9, 18, 9, 0, 9, 18, 9, 27, 81, 81, 27, 0, 9, 18, 9, 27, 81, 81, 27, 27, 81, 81, 108, 324, 486, 324, 81, 0, 0, 3, 3, 0, 9, 18, 9, 0, 9, 18, 9, 27, 81, 81, 27, 0, 9, 18, 9, 27, 81, 81, 27 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..84.

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: A269707 A109247 A021307 * A245320 A152893 A297978

Adjacent sequences:  A170849 A170850 A170851 * A170853 A170854 A170855

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 02 2010

STATUS

approved

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Last modified October 15 10:46 EDT 2019. Contains 328026 sequences. (Running on oeis4.)