2,2
I would very much like to find a formula for this - N. J. A. Sloane (njas(AT)research.att.com).
Sequence in context: A125785 A186651 A108982 * A000708 A027248 A192481
Adjacent sequences: A059721 A059722 A059723 * A059725 A059726 A059727
nonn
N. J. A. Sloane (njas(AT)research.att.com), Feb 09 2001