

A183127


Number of toothpicks added at nth 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
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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), 157191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n1)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(n2)), 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



