A160409 First differences of toothpick numbers A160408.

1, 1, 2, 4, 4, 4, 4, 4, 8, 16, 16, 8, 4, 4, 8

Offset: 1

Author

Omar E. Pol, May 23 2009

Keywords

• more
• nonn

Comments

Number of toothpick added to the toothpick pyramid at the round n.

See also the toothpick sequences A139250, A160160 and the toothpick triangle A160406.

Examples

			Contribution from _Omar E. Pol_, Jun 06 2009: (Start)
Array begins:
========
x, y, z
========
1, 1, 2;
4, 4, 4;
4, 4, 8;
16, 16, 8;
4, 4, 8;
(End)
		

Links

• 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. A139250, A139251, A160160, A160161, A160406, A160407, A160408.

Extensions

More terms from Omar E. Pol, Jun 06 2009