

A160408


Toothpick pyramid (see Comments lines for definition).


7



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

0,3


COMMENTS

The toothpick pyramid is a threedimensional 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 nth 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), 157191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n1)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: A335738 A010066 A180490 * A221707 A186146 A006638
Adjacent sequences: A160405 A160406 A160407 * A160409 A160410 A160411


KEYWORD

more,nonn


AUTHOR

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


STATUS

approved



