A160408 Toothpick pyramid (see Comments lines for definition).

0, 1, 2, 4, 8, 12, 16, 20, 24, 32, 48, 64, 72, 76, 80, 88

Offset

0,3

Comments

The toothpick pyramid is a three-dimensional version of the toothpick triangle A160406.

The sequence gives the number of toothpicks after n rounds. A160409 (the first differences) gives the number added at the n-th round.

See also the entry A139250 for more information about the toothpick sequences.

Links

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

Crossrefs

Cf. A139250, A139251, A160160, A160406, A160407, A160409.

Sequence in context: A010066 A180490 A376616 * A221707 A186146 A375984

Adjacent sequences: A160405 A160406 A160407 * A160409 A160410 A160411

Keyword

more,nonn

Author

Omar E. Pol, May 23 2009, Jun 06 2009

Status

approved