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

Author

Omar E. Pol, May 26 2009

Keywords

• nonn

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.

Extensions

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