A170850 G.f.: Product_{k>=0} (1 + 3x^(2^k-1) + 3x^(2^k)).

4, 15, 21, 21, 57, 108, 90, 39, 57, 108, 126, 234, 495, 594, 351, 93, 57, 108, 126, 234, 495, 594, 387, 288, 495, 702, 1080, 2187, 3267, 2835, 1296, 255, 57, 108, 126, 234, 495, 594, 387, 288, 495, 702, 1080, 2187, 3267, 2835, 1332, 450, 495, 702, 1080, 2187, 3267, 2943

Offset

0,1

Links

Table of n, a(n) for n=0..53.

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: A225562 A301707 A100783 * A297711 A055465 A209870

Adjacent sequences: A170847 A170848 A170849 * A170851 A170852 A170853

Keyword

nonn

Author

N. J. A. Sloane, Jan 02 2010

Status

approved