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A161831 First differences of A161830. 10
1, 2, 2, 4, 2, 4, 4, 8, 4, 4, 4, 8, 6, 8, 10, 18, 10, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

LINKS

Table of n, a(n) for n=1..18.

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. A139250, A139251, A160121, A160407, A161830, A161832, A161833.

Sequence in context: A293664 A001316 A285741 * A096865 A116466 A116467

Adjacent sequences:  A161828 A161829 A161830 * A161832 A161833 A161834

KEYWORD

more,nonn

AUTHOR

Omar E. Pol, Jun 20 2009

STATUS

approved

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Last modified October 16 11:11 EDT 2019. Contains 328056 sequences. (Running on oeis4.)