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A170846
G.f.: Product_{k>=2} (1 + 3x^(2^k-1) + x^(2^k)).
0
1, 0, 0, 3, 1, 0, 0, 3, 1, 0, 9, 6, 1, 0, 0, 3, 1, 0, 9, 6, 1, 0, 9, 6, 1, 27, 27, 9, 1, 0, 0, 3, 1, 0, 9, 6, 1, 0, 9, 6, 1, 27, 27, 9, 1, 0, 9, 6, 1, 27, 27, 9, 1, 27, 27, 9, 82, 108, 54, 12, 1, 0, 0, 3, 1, 0, 9, 6, 1, 0, 9, 6, 1, 27, 27, 9, 1, 0, 9, 6, 1, 27, 27, 9, 1, 27, 27, 9, 82, 108, 54, 12, 1, 0
OFFSET
0,4
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: A107131 A027200 A035654 * A085604 A345371 A306268
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 02 2010
STATUS
approved