A151726 First differences of A151725.

0, 1, 8, 4, 20, 4, 20, 20, 44, 4, 20, 20, 44, 28, 60, 76, 92, 4, 20, 20, 44, 28, 60, 76, 92, 28, 60, 84, 116, 116, 196, 236, 188, 4, 20, 20, 44, 28, 60, 76, 92, 28, 60, 84, 116, 116, 196, 236, 188, 28, 60, 84, 116, 116, 196, 244, 212, 116, 204, 284, 348, 428

Offset: 0

Author

David Applegate and N. J. A. Sloane, Jun 13 2009

Keywords

• nonn
• tabf
• look

Examples

			May be written as a triangle:
0,
1,
8,
4,20,
4,20,20,44,
4,20,20,44,28,60,76,92,
4,20,20,44,28,60,76,92,28,60,84,116,116,196,236,188,
4,20,20,44,28,60,76,92,28,60,84,116,116,196,236,188,28,60,84,116,116,196,244,212,116,204,...
The rows converge to A151727.
		

Links

• David Applegate, Table of n, a(n) for n = 0..1000
• 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
• David Applegate, The movie version

Crossrefs

Cf. A151725, A151727-A151729.

Cf. A139251. [From Omar E. Pol, Dec 14 2009]

Formula

For a recurrence see the Applegate-Pol-Sloane paper.