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A183127 Number of toothpicks added at n-th stage to the toothpick structure of A183126. 2
0, 1, 6, 16, 16, 40, 16, 40, 40, 112, 16, 40, 40, 112, 40, 112, 112, 328, 16, 40, 40, 112, 40, 112, 112, 328, 40, 112, 112, 328, 112, 328, 328, 976, 16, 40, 40, 112, 40, 112, 112, 328, 40, 112, 112, 328, 112, 328 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Essentially the first differences of A183126.

LINKS

Table of n, a(n) for n=0..47.

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

FORMULA

a(n) = 4*(1 + 3^A000120(n-2)), n >= 3. - Nathaniel Johnston, Apr 06 2011

CROSSREFS

Cf. A139250, A139251, A160173, A161411, A183126, A183149.

Sequence in context: A046629 A291795 A301831 * A222884 A230949 A231023

Adjacent sequences:  A183124 A183125 A183126 * A183128 A183129 A183130

KEYWORD

nonn

AUTHOR

Omar E. Pol, Mar 28 2011

EXTENSIONS

Terms a(0) - a(10) confirmed and terms a(11) - a(35) added by John W. Layman, Mar 30 2011

a(36) - a(47) from Nathaniel Johnston, Apr 06 2011

STATUS

approved

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Last modified October 21 21:46 EDT 2019. Contains 328315 sequences. (Running on oeis4.)