A160409 First differences of toothpick numbers A160408.

1, 1, 2, 4, 4, 4, 4, 4, 8, 16, 16, 8, 4, 4, 8

Offset

1,3

Comments

Number of toothpick added to the toothpick pyramid at the round n.

See also the toothpick sequences A139250, A160160 and the toothpick triangle A160406.

Links

Table of n, a(n) for n=1..15.

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

Example

Contribution from Omar E. Pol, Jun 06 2009: (Start)
Array begins:
========
x, y, z
========
1, 1, 2;
4, 4, 4;
4, 4, 8;
16, 16, 8;
4, 4, 8;
(End)

Crossrefs

Cf. A139250, A139251, A160160, A160161, A160406, A160407, A160408.

Sequence in context: A159461 A046930 A302254 * A035645 A063440 A008497

Adjacent sequences: A160406 A160407 A160408 * A160410 A160411 A160412

Keyword

more,nonn

Author

Omar E. Pol, May 23 2009

Extensions

More terms from Omar E. Pol, Jun 06 2009

Status

approved