0,3

R. J. Mathar, Table of n, a(n) for n = 1..200

a(2n) = A001728(n). Cf. A006873.

Sequence in context: A143031 A166118 A063396 this_sequence A156205 A065906 A154060

Adjacent sequences: A000810 A000811 A000812 this_sequence A000814 A000815 A000816

nonn

N. J. A. Sloane (njas(AT)research.att.com).