login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A151555 G.f.: (1 + 2x ) * Prod_{ n >= 1} (1 + x^(2^n-1) + 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 (list; graph; refs; listen; history; text; internal format)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 22 13:31 EDT 2018. Contains 316459 sequences. (Running on oeis4.)