A151867 a(0)=0; a(1)=0; a(2)=0; 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, 0, 0, 1, 0, 0, 2, 3, 0, 0, 2, 2, 0, 4, 10, 7, 0, 0, 2, 2, 0, 4, 10, 6, 0, 4, 8, 4, 8, 28, 34, 15, 0, 0, 2, 2, 0, 4, 10, 6, 0, 4, 8, 4, 8, 28, 34, 14, 0, 4, 8, 4, 8, 28, 32, 12, 8, 24, 24, 24, 72, 124, 98, 31, 0, 0, 2, 2, 0, 4, 10, 6, 0, 4, 8, 4, 8, 28, 34, 14, 0, 4, 8, 4, 8, 28, 32, 12, 8, 24, 24, 24

Offset

0,7

Links

Table of n, a(n) for n=0..91.

Formula

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

Crossrefs

Cf. A151843-A151874.

Sequence in context: A097109 A160018 A175099 * A262563 A170843 A362961

Adjacent sequences: A151864 A151865 A151866 * A151868 A151869 A151870

Keyword

nonn

Author

N. J. A. Sloane, Jul 17 2009

Status

approved