



2, 4, 7, 8, 7, 12, 19, 16, 7, 12, 23, 32, 27, 28, 43, 32, 7, 12, 23, 32, 31, 40, 63, 72, 43, 28, 55, 84, 79, 72, 99, 64, 7, 12, 23, 32, 31, 40, 63, 72, 47, 40, 71, 112, 119, 112, 143, 152, 75, 28, 55, 84, 91, 108, 163, 204, 151, 88, 131, 204, 207, 180, 219, 128
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OFFSET

0,1


LINKS

Olaf Voß, Table of n, a(n) for n = 0..998
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
Olaf Voß, Toothpick structures on hexagonal net
Index entries for sequences related to toothpick sequences


EXAMPLE

From Omar E. Pol, Nov 01 2014: (Start)
When written as an irregular triangle with row lengths A011782:
2;
4;
7, 8;
7, 12, 19, 16;
7, 12, 23, 32, 27, 28, 43, 32;
7, 12, 23, 32, 31, 40, 63, 72, 43, 28, 55, 84, 79, 72, 99, 64;
7, 12, 23, 32, 31, 40, 63, 72, 47, 40, 71, 112, 119, 112, 143, 152, 75, 28, 55, 84, 91, 108, 163, 204, 151, 88, 131, 204, 207, 180, 219, 128;
The right border gives the even powers of 2, at least up a(2^91).
(End)


CROSSREFS

Cf. A139250, A139251, A151724, A182633, A182840, A182841.
Sequence in context: A166928 A237199 A092577 * A009282 A141745 A301936
Adjacent sequences: A182839 A182840 A182841 * A182843 A182844 A182845


KEYWORD

nonn,tabf


AUTHOR

Omar E. Pol, Dec 11 2010


EXTENSIONS

More terms from Olaf Voß, Dec 24 2010
Wiki link added by Olaf Voß, Jan 14 2011


STATUS

approved



