A151682 a(n) = Sum_{k >= 0, k odd} binomial(wt(n+k),k+1), where wt() = A000120().

1, 1, 2, 1, 3, 2, 3, 1, 3, 2, 4, 3, 7, 3, 4, 1, 3, 2, 4, 3, 7, 3, 5, 3, 7, 4, 9, 7, 14, 4, 5, 1, 3, 2, 4, 3, 7, 3, 5, 3, 7, 4, 9, 7, 14, 4, 6, 3, 7, 4, 9, 7, 14, 5, 10, 7, 15, 9, 21, 14, 25, 5, 6, 1, 3, 2, 4, 3, 7, 3, 5, 3, 7, 4, 9, 7, 14, 4, 6, 3, 7, 4, 9, 7, 14, 5, 10, 7, 15, 9, 21, 14, 25, 5, 7, 3, 7, 4, 9

Offset

0,3

Links

Table of n, a(n) for n=0..98.

Crossrefs

Cf. A000120.

Sequence in context: A189231 A107337 A066376 * A318928 A159918 A278573

Adjacent sequences: A151679 A151680 A151681 * A151683 A151684 A151685

Keyword

nonn

Author

N. J. A. Sloane, Jun 01 2009

Status

approved