A170846 G.f.: Product_{k>=2} (1 + 3x^(2^k-1) + x^(2^k)).

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

Table of n, a(n) for n=0..93.

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.]

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

Crossrefs

Sequence in context: A107131 A027200 A035654 * A085604 A345371 A306268

Adjacent sequences: A170843 A170844 A170845 * A170847 A170848 A170849

Keyword

nonn

Author

N. J. A. Sloane, Jan 02 2010

Status

approved