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A161214 a(n) = A161210(n)*3. 3
0, 3, 9, 21, 42, 63, 84 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..6.

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, A152980, A153006, A160160, A161210, A161212, A161215, A161216.

Sequence in context: A024173 A097119 A146608 * A213396 A011843 A080549

Adjacent sequences:  A161211 A161212 A161213 * A161215 A161216 A161217

KEYWORD

more,nonn

AUTHOR

Omar E. Pol, Jun 06 2009

STATUS

approved

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Last modified November 13 10:29 EST 2019. Contains 329093 sequences. (Running on oeis4.)