1,2
Cf. A000040.
Sequence in context: A194927 A089043 A034236 * A053420 A001802 A122590
Adjacent sequences: A058012 A058013 A058014 * A058016 A058017 A058018
nonn
Harrison Brown (nanb(AT)mindspring.com), Nov 14 2000
Two more terms from Erich Friedman (efriedma(AT)stetson.edu), Jun 15 2001