1,5
Cf. A000162, A066454.
Sequence in context: A056122 A036828 A142613 * A114756 A159563 A179818
Adjacent sequences: A066450 A066451 A066452 * A066454 A066455 A066456
nonn
Brendan Owen (brendan_owen(AT)yahoo.com), Dec 27 2001