A170868 a(0) = 1, a(1) = 2; a(2^i + j) = 3a(j) + a(j + 1) for 0 <= j < 2^i.

1, 2, 5, 11, 5, 11, 26, 38, 5, 11, 26, 38, 26, 59, 116, 119, 5, 11, 26, 38, 26, 59, 116, 119, 26, 59, 116, 140, 137, 293, 467, 362, 5, 11, 26, 38, 26, 59, 116, 119, 26, 59, 116, 140, 137, 293, 467, 362, 26, 59, 116, 140, 137, 293, 467, 383, 137, 293, 488, 557, 704, 1346, 1763

Offset

0,2

Links

Table of n, a(n) for n=0..62.

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

Sequence in context: A286091 A363554 A127011 * A357588 A276736 A069162

Adjacent sequences: A170865 A170866 A170867 * A170869 A170870 A170871

Keyword

nonn

Author

N. J. A. Sloane, Jan 02 2010

Status

approved