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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A170839 G.f.: Prod_{k >= 1} (1 + x^(2^k-1) + 3x^(2^k)). 0
1, 1, 3, 1, 4, 6, 9, 1, 4, 6, 10, 7, 18, 27, 27, 1, 4, 6, 10, 7, 18, 27, 28, 7, 18, 28, 37, 39, 81, 108, 81, 1, 4, 6, 10, 7, 18, 27, 28, 7, 18, 28, 37, 39, 81, 108, 82, 7, 18, 28, 37, 39, 81, 109, 91, 39, 82, 121, 150, 198, 351, 405, 243, 1, 4, 6, 10, 7, 18, 27, 28, 7, 18, 28, 37, 39, 81 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..76.

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: A072267 A024934 A186358 * A049918 A028861 A081521

Adjacent sequences:  A170836 A170837 A170838 * A170840 A170841 A170842

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 21 20:03 EST 2019. Contains 319350 sequences. (Running on oeis4.)