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A170863 a(0) = 1, a(1) = 1; a(2^i + j) = 3a(j) + a(j + 1) for 0 <= j < 2^i. 0
1, 1, 4, 7, 4, 7, 19, 25, 4, 7, 19, 25, 19, 40, 82, 79, 4, 7, 19, 25, 19, 40, 82, 79, 19, 40, 82, 94, 97, 202, 325, 241, 4, 7, 19, 25, 19, 40, 82, 79, 19, 40, 82, 94, 97, 202, 325, 241, 19, 40, 82, 94, 97, 202, 325, 256, 97, 202, 340, 379, 493, 931, 1216, 727, 4, 7, 19, 25, 19, 40 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

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

Sequence in context: A081884 A059143 A094765 * A021682 A242187 A094692

Adjacent sequences:  A170860 A170861 A170862 * A170864 A170865 A170866

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 02 2010

STATUS

approved

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Last modified December 14 15:08 EST 2019. Contains 329979 sequences. (Running on oeis4.)