

A151555


G.f.: (1 + 2x ) * Prod_{ n >= 1} (1 + x^(2^n1) + 2*x^(2^n)).


5



1, 3, 4, 5, 5, 10, 12, 9, 5, 10, 13, 15, 20, 32, 32, 17, 5, 10, 13, 15, 20, 32, 33, 23, 20, 33, 41, 50, 72, 96, 80, 33, 5, 10, 13, 15, 20, 32, 33, 23, 20, 33, 41, 50, 72, 96, 81, 39, 20, 33, 41, 50, 72, 97, 89, 66, 73, 107, 132, 172, 240, 272, 192, 65, 5, 10, 13, 15, 20, 32, 33, 23
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OFFSET

0,2


COMMENTS

Contribution from Gary W. Adamson, May 25 2009: (Start)
Convolved with A078008 signed (A151575) [1, 0, 2, 2, 6, 10, 22, 42, 86, 170,...]
equals the toothpick sequence A153006: (1, 3, 6, 9, 13, 20, 28,...). (End)
If A151550 is written as a triangle then the rows converge to this sequence.  N. J. A. Sloane, Jun 16 2009


LINKS

N. J. A. Sloane, Table of n, a(n) for n = 0..16384
David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS


EXAMPLE

Contribution from Omar E. Pol, Jun 19 2009: (Start)
May be written as a triangle:
1;
3;
4,5;
5,10,12,9;
5,10,13,15,20,32,32,17;
5,10,13,15,20,32,33,23,20,33,41,50,72,96,80,33;
5,10,13,15,20,32,33,23,20,33,41,50,72,96,81,39,20,33,41,50,72,97,89,66,73,...
(End)


CROSSREFS

Cf. A139250, A151551, A151552, A151553, A151554, A151550, A152980, A153006.
Cf. A078008 [From Gary W. Adamson, May 25 2009]
Sequence in context: A278168 A130271 A139369 * A263728 A103606 A139794
Adjacent sequences: A151552 A151553 A151554 * A151556 A151557 A151558


KEYWORD

nonn


AUTHOR

N. J. A. Sloane, May 20 2009


STATUS

approved



