A160425 a(n) = number of grid points that are covered after n-th rounds of A160120.

0, 4, 10, 19, 31, 40

Offset

0,2

Links

Table of n, a(n) for n=0..5.

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, A147614, A160120, A160121, A160128.

Sequence in context: A219965 A008038 A301248 * A152946 A162505 A025720

Adjacent sequences: A160422 A160423 A160424 * A160426 A160427 A160428

Keyword

more,nonn

Author

Omar E. Pol, Jun 01 2009

Status

approved