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A160724 a(n) = A160714(n)*3. 3
0, 3, 6, 15, 18, 27, 36, 63, 66 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The sequence gives the number of T-toothpicks in the structure after n rounds.

See A160172 and A160714 for more information about T-toothpick sequences.

LINKS

Table of n, a(n) for n=0..8.

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, A160172, A160173, A160714, A160724, A160726.

Sequence in context: A176547 A310125 A124518 * A212060 A249246 A248969

Adjacent sequences:  A160721 A160722 A160723 * A160725 A160726 A160727

KEYWORD

more,nonn

AUTHOR

Omar E. Pol, Jun 02 2009

STATUS

approved

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Last modified November 20 20:28 EST 2019. Contains 329347 sequences. (Running on oeis4.)