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

0, 4, 10, 19, 31, 40

Offset: 0

Author

Omar E. Pol, Jun 01 2009

Keywords

• more
• nonn

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, A147614, A160120, A160121, A160128.