0,4

Also A047754(4n+1). The proof is elementary and involves reducing both expressions via the various linear expansions with A001764, A047753, A047751 and A047749 which are found in these sequences. - R. J. Mathar, Oct 18 2008

Table of n, a(n) for n=0..23.

Sequence in context: A331883 A047770 A047757 * A047768 A022032 A255118

Adjacent sequences: A047752 A047753 A047754 * A047756 A047757 A047758

nonn

N. J. A. Sloane

Edited by N. J. A. Sloane, Jan 17 2009 at the suggestion of R. J. Mathar

approved