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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

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: A224864 A176547 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 February 25 03:33 EST 2018. Contains 299630 sequences. (Running on oeis4.)