A168115 a(n) = A139560(n+1)/2.

1, 1, 1, 2, 2, 1, 1, 2, 2, 2, 4, 6, 4, 1, 1, 2, 2, 2, 4, 6, 4, 2, 4, 6, 6, 8, 14, 16, 8, 1, 1, 2, 2, 2, 4, 6, 4, 2, 4, 6, 6, 8, 14, 16, 8, 2, 4, 6, 6, 8, 14, 16, 10, 8, 14, 18, 20, 30, 44, 40, 16, 1, 1, 2, 2, 2, 4, 6, 4, 2, 4, 6, 6, 8, 14, 16

Offset: 1

Author

Omar E. Pol, Dec 09 2009

Keywords

• 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, A139252, A139560.

Extensions

Terms after a(27) from Nathaniel Johnston, Mar 29 2011