A151869 a(0)=0; a(1)=1; a(2)=2; for n>=3 if n=2^i + j with 0<=j<2^i then a(n)=2*a(j) + 2*a(j + 1) except we add 1 if j=2^i-1.

0, 1, 2, 7, 2, 6, 18, 19, 2, 6, 18, 18, 16, 48, 74, 43, 2, 6, 18, 18, 16, 48, 74, 42, 16, 48, 72, 68, 128, 244, 234, 91, 2, 6, 18, 18, 16, 48, 74, 42, 16, 48, 72, 68, 128, 244, 234, 90, 16, 48, 72, 68, 128, 244, 232, 116, 128, 240, 280, 392, 744, 956, 650, 187, 2, 6, 18, 18, 16

Offset

0,3

Links

Table of n, a(n) for n=0..68.

Formula

I would very much like a g.f. for this sequence!

Crossrefs

Cf. A151843-A151874.

Sequence in context: A157513 A087706 A102447 * A262083 A181284 A010697

Adjacent sequences: A151866 A151867 A151868 * A151870 A151871 A151872

Keyword

nonn

Author

N. J. A. Sloane, Jul 17 2009

Status

approved