A170849 G.f.: Product_{k>=2} (1 + 3x^(2^k-1) + 2x^(2^k)).

1, 0, 0, 3, 2, 0, 0, 3, 2, 0, 9, 12, 4, 0, 0, 3, 2, 0, 9, 12, 4, 0, 9, 12, 4, 27, 54, 36, 8, 0, 0, 3, 2, 0, 9, 12, 4, 0, 9, 12, 4, 27, 54, 36, 8, 0, 9, 12, 4, 27, 54, 36, 8, 27, 54, 36, 89, 216, 216, 96, 16, 0, 0, 3, 2, 0, 9, 12, 4, 0, 9, 12, 4, 27, 54, 36, 8, 0, 9, 12, 4, 27, 54, 36, 8, 27, 54, 36

Offset

0,4

Links

Table of n, a(n) for n=0..87.

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, OEIS wiki.

Crossrefs

Sequence in context: A133949 A139808 A055654 * A292260 A322114 A062787

Adjacent sequences: A170846 A170847 A170848 * A170850 A170851 A170852

Keyword

nonn

Author

N. J. A. Sloane, Jan 02 2010

Status

approved