A170840 G.f.: Product_{k>=2} (1 + x^(2^k-1) + 3x^(2^k)).

1, 0, 0, 1, 3, 0, 0, 1, 3, 0, 1, 6, 9, 0, 0, 1, 3, 0, 1, 6, 9, 0, 1, 6, 9, 1, 9, 27, 27, 0, 0, 1, 3, 0, 1, 6, 9, 0, 1, 6, 9, 1, 9, 27, 27, 0, 1, 6, 9, 1, 9, 27, 27, 1, 9, 27, 28, 12, 54, 108, 81, 0, 0, 1, 3, 0, 1, 6, 9, 0, 1, 6, 9, 1, 9, 27, 27, 0, 1, 6, 9, 1, 9, 27, 27, 1, 9, 27, 28, 12, 54, 108, 81, 0

Offset

0,5

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: A165974 A090622 A035696 * A300725 A035630 A126723

Adjacent sequences: A170837 A170838 A170839 * A170841 A170842 A170843

Keyword

nonn

Author

N. J. A. Sloane, Jan 02 2010

Status

approved