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A170871
a(0) = 1, a(1) = 2; a(2^i + j) = 2a(j) + 3a(j + 1) for 0 <= j < 2^i.
0
1, 2, 8, 28, 8, 28, 100, 80, 8, 28, 100, 80, 100, 356, 440, 184, 8, 28, 100, 80, 100, 356, 440, 184, 100, 356, 440, 460, 1268, 2032, 1432, 392, 8, 28, 100, 80, 100, 356, 440, 184, 100, 356, 440, 460, 1268, 2032, 1432, 392, 100, 356, 440, 460, 1268, 2032, 1432, 668, 1268
OFFSET
0,2
LINKS
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.]
CROSSREFS
Sequence in context: A287204 A299640 A197932 * A245996 A229935 A082107
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 02 2010
STATUS
approved