1,1
Cf. A051154-A051156.
Sequence in context: A046884 A203677 A099499 * A177918 A177816 A130653
Adjacent sequences: A051154 A051155 A051156 * A051158 A051159 A051160
nonn,easy
N. J. A. Sloane (njas(AT)research.att.com).