A170839 G.f.: Product_{k>=1} (1 + x^(2^k-1) + 3x^(2^k)).

1, 1, 3, 1, 4, 6, 9, 1, 4, 6, 10, 7, 18, 27, 27, 1, 4, 6, 10, 7, 18, 27, 28, 7, 18, 28, 37, 39, 81, 108, 81, 1, 4, 6, 10, 7, 18, 27, 28, 7, 18, 28, 37, 39, 81, 108, 82, 7, 18, 28, 37, 39, 81, 109, 91, 39, 82, 121, 150, 198, 351, 405, 243, 1, 4, 6, 10, 7, 18, 27, 28, 7, 18, 28, 37, 39, 81

Offset

0,3

Links

Table of n, a(n) for n=0..76.

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: A072267 A024934 A186358 * A049918 A357182 A028861

Adjacent sequences: A170836 A170837 A170838 * A170840 A170841 A170842

Keyword

nonn

Author

N. J. A. Sloane, Jan 02 2010

Status

approved