A161332 - OEIS

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A161332

a(n) = A161331(n)/2.

0, 1, 3, 3, 3, 9, 3, 9, 9, 9, 15, 9, 15, 21, 3, 9, 9, 15, 27, 15, 39, 21, 27, 39, 21, 33, 39, 9, 21, 21, 27, 45, 33, 63, 45, 45, 51, 33, 39, 45, 45, 45, 27, 33, 57, 39, 63, 63, 51, 51, 69, 51, 81, 51, 57, 81, 63, 81, 57, 51, 51, 63, 93, 93, 75, 69, 63

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OFFSET

0,3

COMMENTS

Number of E-toothpicks added at n-th stage to the structure of A161334. - Omar E. Pol, Jan 07 2014

LINKS

Table of n, a(n) for n=0..66.

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, A single E-toothpick ç

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

CROSSREFS

Cf. A161330, A161331, A161334.

Sequence in context: A362376 A201539 A223747 * A217547 A285583 A253358

Adjacent sequences: A161329 A161330 A161331 * A161333 A161334 A161335

KEYWORD

nonn

AUTHOR

Omar E. Pol, Jun 07 2009

EXTENSIONS

More terms from Omar E. Pol, Jan 07 2014

STATUS

approved