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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A151710 First differences of A160715. 7
1, 3, 3, 9, 3, 9, 9, 21, 3, 9, 9, 21, 15, 21, 27, 51, 3, 9, 9, 21, 15, 21, 27, 51, 21, 21, 27, 51 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Number of Y-toothpick added at n-th stage to the structure of A160715.

Similar to A160121. [From Omar E. Pol, May 29 2010]

LINKS

Table of n, a(n) for n=1..28.

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, Dec 18 2012 (Start):

Written as an irregular triangle begins:

1;

3;

3, 9;

3, 9, 9, 21;

3, 9, 9, 21, 15, 21, 27, 51;

3, 9, 9, 21, 15, 21, 27, 51, 21, 21, 27, 51,...

(End)

CROSSREFS

Cf. A000225, A006516, A139250, A160120.

Cf. A048883, A139251, A151837, A160121.

Sequence in context: A165824 A256689 A266533 * A160121 A048883 A241717

Adjacent sequences:  A151707 A151708 A151709 * A151711 A151712 A151713

KEYWORD

more,nonn

AUTHOR

Omar E. Pol, Jun 02 2009

EXTENSIONS

More terms from Omar E. Pol, May 29 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 25 22:18 EST 2018. Contains 299662 sequences. (Running on oeis4.)