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A160803 First differences of A160802. 4
1, 2, 4, 4, 4, 6, 4, 3, 2, 3, 4, 1, 2, 3, 2, 2, 4, 6, 5, 3, 5, 5, 2, 2, 2, 2, 3, 4, 3, 2, 3, 4, 4, 5, 8, 8, 4, 1, 2, 3, 3, 4, 7, 8, 5, 4, 7, 9, 10, 15, 22, 12, 7, 2, 2, 3, 4, 5, 6, 7, 6, 5, 7, 10, 13, 16, 18, 9, 8, 3, 3, 6, 9, 8, 7 (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

Nathaniel Johnston, Table of n, a(n) for n = 1..254

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, A160801, A160802.

Sequence in context: A284581 A284560 A035633 * A278481 A084291 A258573

Adjacent sequences:  A160800 A160801 A160802 * A160804 A160805 A160806

KEYWORD

nonn

AUTHOR

Omar E. Pol, May 26 2009

EXTENSIONS

Terms after a(12) from Nathaniel Johnston, Mar 30 2011

STATUS

approved

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Last modified January 21 13:31 EST 2019. Contains 319350 sequences. (Running on oeis4.)