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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A139560 Number of new segments added to the toothpick structure drawing at the n-th step (extensions of earlier segments are not considered). 6
1, 2, 2, 2, 4, 4, 2, 2, 4, 4, 4, 8, 12, 8, 2, 2, 4, 4, 4, 8, 12, 8, 4, 8, 12, 12, 16, 28, 32, 16, 2, 2, 4, 4, 4, 8, 12, 8, 4, 8, 12, 12, 16, 28, 32, 16, 4, 8, 12, 12, 16, 28, 32, 20, 16, 28, 36, 40, 60, 88, 80, 32 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

First differences of A139252.

LINKS

Table of n, a(n) for n=1..62.

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

FORMULA

a(n)=A139252(n)-A139252(n-1).

CROSSREFS

Cf. A139250, A139251, A139252, A139253, A139254, A139559.

Sequence in context: A071472 A064135 A179651 * A192095 A105080 A206424

Adjacent sequences:  A139557 A139558 A139559 * A139561 A139562 A139563

KEYWORD

nonn

AUTHOR

Omar E. Pol, May 17 2008

EXTENSIONS

Terms after a(28) from Nathaniel Johnston, Mar 29 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 18 23:26 EST 2018. Contains 299330 sequences. (Running on oeis4.)