1,1
Cf. A002997, A135717, A006931, A135719, A135720.
Sequence in context: A137198 A194231 A141705 * A047713 A006971 A104016
Adjacent sequences: A135718 A135719 A135720 * A135722 A135723 A135724
nonn
Artur Jasinski (grafix(AT)csl.pl), Nov 25 2007