1,1
See A001605, which is the main entry for this sequence.
Sequence in context: A068482 A068499 A137172 * A181312 A061018 A130126
Adjacent sequences: A069741 A069742 A069743 * A069745 A069746 A069747
nonn
Steven L Plummer (plummers(AT)bigfoot.com), Apr 21 2002