0,1

A004168 := proc(n) option remember; if n=0 then 3 else A004168(n-1)*(A004168(n-1)+1); fi; end;

Adjacent sequences: A004165 A004166 A004167 this_sequence A004169 A004170 A004171

Sequence in context: A056417 A098152 A028301 this_sequence A061960 A120606 A089428

nonn,easy

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