A160803 First differences of A160802.

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

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