a(1) = 2, a(n) = 2*a(n-1)^2 - a(n-1) for n > 1.A097419a(1) = 2, a(n) = 2*a(n-1)^2 - a(n-1) for n > 1.Terms a(0) =2a(1) =6a(2) =66a(3) =8646a(4) =149497986External referencesoeis: A097419