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A151551 G.f.: (1 + 3x) * Product_{n>=1} (1 + x^(2^n-1) + 2*x^(2^n)). 5
1, 4, 5, 7, 6, 13, 16, 13, 6, 13, 17, 20, 25, 42, 44, 25, 6, 13, 17, 20, 25, 42, 45, 32, 25, 43, 54, 65, 92, 128, 112, 49, 6, 13, 17, 20, 25, 42, 45, 32, 25, 43, 54, 65, 92, 128, 113, 56, 25, 43, 54, 65, 92, 129, 122, 89, 93, 140, 173, 222, 312, 368, 272, 97, 6, 13, 17, 20, 25, 42 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..69.

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

Cf. A139250, A151550, A151552.

Sequence in context: A003563 A336753 A023833 * A021690 A109896 A004221

Adjacent sequences:  A151548 A151549 A151550 * A151552 A151553 A151554

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 19 2009

STATUS

approved

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Last modified November 26 07:57 EST 2022. Contains 358354 sequences. (Running on oeis4.)