A170841 G.f.: Product_{k>=0} (1 + 2x^(2^k-1) + 3x^(2^k)).

3, 9, 15, 15, 27, 57, 63, 33, 27, 57, 75, 99, 195, 297, 243, 87, 27, 57, 75, 99, 195, 297, 255, 153, 195, 321, 423, 687, 1179, 1377, 891, 249, 27, 57, 75, 99, 195, 297, 255, 153, 195, 321, 423, 687, 1179, 1377, 903, 315, 195, 321, 423, 687, 1179, 1401, 1071, 849, 1227

Offset

0,1

Links

Table of n, a(n) for n=0..56.

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: A310325 A310326 A310327 * A090158 A030342 A273323

Adjacent sequences: A170838 A170839 A170840 * A170842 A170843 A170844

Keyword

nonn

Author

N. J. A. Sloane, Jan 02 2010

Status

approved