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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 (list; graph; refs; listen; history; text; internal format)
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
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.]
CROSSREFS
Sequence in context: A364056 A010066 A180490 * A221707 A186146 A006638
KEYWORD
more,nonn
AUTHOR
Omar E. Pol, May 23 2009, Jun 06 2009
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)