A151873 a(0)=1; a(1)=1; a(2)=4; 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.

1, 1, 4, 11, 4, 10, 30, 31, 4, 10, 30, 30, 28, 80, 122, 71, 4, 10, 30, 30, 28, 80, 122, 70, 28, 80, 120, 116, 216, 404, 386, 151, 4, 10, 30, 30, 28, 80, 122, 70, 28, 80, 120, 116, 216, 404, 386, 150, 28, 80, 120, 116, 216, 404, 384, 196, 216, 400, 472, 664, 1240, 1580, 1074, 311

Offset

0,3

Links

Table of n, a(n) for n=0..63.

Formula

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

Crossrefs

Cf. A151843-A151874.

Sequence in context: A091387 A091388 A269742 * A354274 A205136 A096735

Adjacent sequences: A151870 A151871 A151872 * A151874 A151875 A151876

Keyword

nonn

Author

N. J. A. Sloane, Jul 17 2009

Status

approved