A172312 a(n) = A172311(n+1)/2.

1, 2, 3, 4, 6, 7, 7, 9, 9, 10, 12, 12, 19, 17, 21, 17, 13, 14, 16, 19, 25, 27, 29, 29, 33, 30, 28, 25, 33, 33, 33, 35, 21, 26, 28, 27, 31, 33, 39, 44

Offset

1,2

Links

Table of n, a(n) for n=1..40.

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, A172310, A172311.

Sequence in context: A072766 A071652 A089884 * A086163 A175059 A366429

Adjacent sequences: A172309 A172310 A172311 * A172313 A172314 A172315

Keyword

nonn

Author

Omar E. Pol, Jan 31 2010

Extensions

More terms from Nathaniel Johnston, Nov 15 2010

Status

approved