1,1
Cf. A001122 A000040.
Sequence in context: A088607 A162699 A173263 * A047623 A190523 A161781
Adjacent sequences: A141228 A141229 A141230 * A141232 A141233 A141234
nonn
Vladimir Shevelev (shevelev(AT)bgu.ac.il), Jun 16 2008