
0, 1, 4, 4, 4, 12, 4, 12, 12, 12, 20, 12, 20, 28, 4, 12, 12, 12, 28, 20, 28, 36, 36, 52, 44, 52, 52, 12, 28, 28, 28, 44, 44, 44, 76, 68, 84, 44, 52, 60, 52, 60, 52, 28, 60, 60, 68, 100, 44, 68, 84, 60, 92, 84, 76, 116, 84, 100, 92, 60, 60, 76, 92, 132, 100, 84
(list;
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OFFSET

0,3


COMMENTS

First differences of A151895. See that entry for much more information.


LINKS

David Applegate, Table of n, a(n) for n = 0..250
David Applegate, The movie version
David Applegate, Illustration of first 10 generations
David Applegate, Illustration of first 20 generations
David Applegate, Illustration of first 32 generations
David Applegate, Illustration of first 64 generations
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, Illustration of initial terms (concentrating on a 90 degree sector)
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS


FORMULA

We do not know of a recurrence or generating function.


CROSSREFS

Cf. A151895, A139250.
Sequence in context: A219578 A219373 A151906 * A267191 A170897 A217771
Adjacent sequences: A151893 A151894 A151895 * A151897 A151898 A151899


KEYWORD

nonn


AUTHOR

David Applegate and N. J. A. Sloane, Jul 30 2009


EXTENSIONS

Revised by David Applegate and N. J. A. Sloane, Jan 21 2016.


STATUS

approved

