A212444 Iterates A212439, starting from 0.

0, 1, 3, 6, 13, 27, 54, 108, 216, 433, 867, 1734, 3469, 6939, 13878, 27756, 55512, 111025, 222050, 444101, 888202, 1776404, 3552808, 7105617, 14211235, 28422470, 56844941, 113689883, 227379766, 454759532, 909519064, 1819038129, 3638076259, 7276152518

Offset

0,3

Comments

2*a(n) <= a(n+1) <= 2*a(n) + 1.

Links

Reinhard Zumkeller, Table of n, a(n) for n = 0..100

Benjamin Chaffin and N. J. A. Sloane, The Curling Number Conjecture, preprint.

Formula

a(n+1) = A212439(a(n)) = 2*a(n) + A181935(a(n)) mod 2, a(0) = 0.

Prog

(Haskell)
a212444 n = a212444_list !! n
a212444_list = iterate a212439 0

Crossrefs

Sequence in context: A281100 A276129 A123247 * A112306 A291753 A033129

Adjacent sequences: A212441 A212442 A212443 * A212445 A212446 A212447

Keyword

nonn

Author

Reinhard Zumkeller, May 17 2012

Status

approved