A160801 First differences of A160800.

1, 2, 4, 2, 1, 2, 3, 1, 1, 2, 3, 3, 3, 5, 5, 2, 1, 2, 3, 2, 2, 4, 6, 5, 3, 5, 5, 2, 2, 4, 6, 1, 2, 3, 2, 2, 4, 6, 5, 3, 5, 5, 2, 2, 4, 6, 5, 4, 7, 8, 6, 8, 14, 17, 13, 10, 9, 8, 3, 3, 4, 5, 6, 7, 8, 7, 6, 8, 11, 14, 17, 19, 10

Offset

1,2

Comments

Number of toothpicks added to the spiral at the n-th stage.

Links

Table of n, a(n) for n=1..73.

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.

Sequence in context: A302828 A321622 A087266 * A177002 A079046 A356474

Adjacent sequences: A160798 A160799 A160800 * A160802 A160803 A160804

Keyword

nonn

Author

Omar E. Pol, May 26 2009

Extensions

Terms after a(32) from Nathaniel Johnston, Mar 30 2011

Status

approved