0,2
Cf. A007565.
Sequence in context: A185612 A145121 A062788 * A191216 A013765 A013891
Adjacent sequences: A048286 A048287 A048288 * A048290 A048291 A048292
nonn,nice,hard
N. J. A. Sloane (njas(AT)research.att.com).
Arlin Anderson (starship1(AT)gmail.com)