1,2

a(n) = A161715(n-1). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 21 2009]

Sequence in context: A018626 A018305 A018693 this_sequence A018727 A161715 A164523

Adjacent sequences: A018252 A018253 A018254 this_sequence A018256 A018257 A018258

nonn,fini,full

N. J. A. Sloane (njas(AT)research.att.com).