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!)
A160801 First differences of A160800. 5
1, 2, 4, 2, 1, 2, 3, 1, 1, 2, 3, 3, 3, 5, 5, 2, 1, 2, 3, 2, 2, 4, 6, 5, 3, 5, 5, 2, 2, 4, 6, 1, 2, 3, 2, 2, 4, 6, 5, 3, 5, 5, 2, 2, 4, 6, 5, 4, 7, 8, 6, 8, 14, 17, 13, 10, 9, 8, 3, 3, 4, 5, 6, 7, 8, 7, 6, 8, 11, 14, 17, 19, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Number of toothpicks added to the spiral at the n-th stage.

LINKS

Table of n, a(n) for n=1..73.

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

Cf. A000045, A139250, A139251, A160426, A160427, A160800.

Sequence in context: A302828 A321622 A087266 * A177002 A079046 A079045

Adjacent sequences:  A160798 A160799 A160800 * A160802 A160803 A160804

KEYWORD

nonn

AUTHOR

Omar E. Pol, May 26 2009

EXTENSIONS

Terms after a(32) from Nathaniel Johnston, Mar 30 2011

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 20 12:29 EST 2019. Contains 319330 sequences. (Running on oeis4.)