0,2
Cf. A042240.
Sequence in context: A041333 A197950 A041715 * A042911 A137918 A114502
Adjacent sequences: A042238 A042239 A042240 * A042242 A042243 A042244
nonn,cofr,easy
N. J. A. Sloane (njas(AT)research.att.com).