a(0) = 3; thereafter, a(n) = a(n-1)^2 - 4.A186751a(0) = 3; thereafter, a(n) = a(n-1)^2 - 4.Terms a(0) =3a(1) =5a(2) =21a(3) =437a(4) =190965a(5) =36467631221External referencesoeis: A186751