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A170869 a(0) = 1, a(1) = 2; a(2^i + j) = 3a(j) + 2a(j + 1) for 0 <= j < 2^i. 0
1, 2, 7, 20, 7, 20, 61, 74, 7, 20, 61, 74, 61, 182, 331, 236, 7, 20, 61, 74, 61, 182, 331, 236, 61, 182, 331, 344, 547, 1208, 1465, 722, 7, 20, 61, 74, 61, 182, 331, 236, 61, 182, 331, 344, 547, 1208, 1465, 722, 61, 182, 331, 344, 547, 1208, 1465, 830, 547, 1208, 1681, 2126 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..59.

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

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

CROSSREFS

Sequence in context: A137990 A056650 A182169 * A162355 A045858 A160677

Adjacent sequences:  A170866 A170867 A170868 * A170870 A170871 A170872

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 02 2010

STATUS

approved

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Last modified February 24 11:12 EST 2018. Contains 299603 sequences. (Running on oeis4.)