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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A161833 First differences of A161832. 3
1, 1, 2, 1, 2, 2, 4, 2, 2, 2, 4, 3, 4, 5, 9, 5, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Number of Y-toothpicks added to the sieve at the n-th round.

LINKS

Table of n, a(n) for n=1..17.

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) = A161831(n+1)/2.

CROSSREFS

Cf. A139251, A160121, A160407, A161830, A161831, A161832.

Sequence in context: A122838 A050378 A225216 * A294100 A139318 A205779

Adjacent sequences:  A161830 A161831 A161832 * A161834 A161835 A161836

KEYWORD

more,nonn

AUTHOR

Omar E. Pol, Jun 20 2009

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 October 15 21:06 EDT 2018. Contains 316237 sequences. (Running on oeis4.)