0,2
Cf. A042128.
Sequence in context: A077900 A198443 A041231 * A141723 A180363 A100845
Adjacent sequences: A042126 A042127 A042128 * A042130 A042131 A042132
nonn,cofr,easy
N. J. A. Sloane (njas(AT)research.att.com).