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

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A170851 G.f.: Prod_{k >= 1} (1 + 3x^(2^k-1) + 3x^(2^k)). 0
1, 3, 3, 3, 12, 18, 9, 3, 12, 18, 18, 45, 90, 81, 27, 3, 12, 18, 18, 45, 90, 81, 36, 45, 90, 108, 189, 405, 513, 324, 81, 3, 12, 18, 18, 45, 90, 81, 36, 45, 90, 108, 189, 405, 513, 324, 90, 45, 90, 108, 189, 405, 513, 351, 243, 405, 594, 891, 1782, 2754, 2511, 1215, 243, 3, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..64.

David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.]

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

CROSSREFS

Sequence in context: A133797 A225073 A152575 * A052900 A024947 A291407

Adjacent sequences:  A170848 A170849 A170850 * A170852 A170853 A170854

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 02 2010

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 16 06:59 EST 2019. Contains 319188 sequences. (Running on oeis4.)