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A170872 a(0) = 1, a(1) = 2; a(2^i + j) = 3a(j) + 3a(j + 1) for 0 <= j < 2^i. 2
1, 2, 9, 33, 9, 33, 126, 126, 9, 33, 126, 126, 126, 477, 756, 405, 9, 33, 126, 126, 126, 477, 756, 405, 126, 477, 756, 756, 1809, 3699, 3483, 1242, 9, 33, 126, 126, 126, 477, 756, 405, 126, 477, 756, 756, 1809, 3699, 3483, 1242, 126, 477, 756, 756, 1809, 3699, 3483, 1593 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..55.

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: A264234 A056916 A139628 * A123142 A122097 A073400

Adjacent sequences:  A170869 A170870 A170871 * A170873 A170874 A170875

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 02 2010

STATUS

approved

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Last modified October 16 21:57 EDT 2018. Contains 316275 sequences. (Running on oeis4.)