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A170867 a(0) = 1, a(1) = 1; a(2^i + j) = 3a(j) + 3a(j + 1) for 0 <= j < 2^i. 0
1, 1, 6, 21, 6, 21, 81, 81, 6, 21, 81, 81, 81, 306, 486, 261, 6, 21, 81, 81, 81, 306, 486, 261, 81, 306, 486, 486, 1161, 2376, 2241, 801, 6, 21, 81, 81, 81, 306, 486, 261, 81, 306, 486, 486, 1161, 2376, 2241, 801, 81, 306, 486, 486, 1161, 2376, 2241, 1026, 1161, 2376, 2916 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..58.

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: A222741 A069257 A133885 * A064929 A298266 A200831

Adjacent sequences:  A170864 A170865 A170866 * A170868 A170869 A170870

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 02 2010

STATUS

approved

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Last modified February 22 09:36 EST 2018. Contains 299448 sequences. (Running on oeis4.)