a(-1)=0. a(n)=a(n-1)^2-2^n.A168319a(-1)=0. a(n)=a(n-1)^2-2^n.Terms a(0) =-1a(1) =-1a(2) =-3a(3) =1a(4) =-15a(5) =193a(6) =37185a(7) =1382724097External referencesoeis: A168319