a(n) = 2*a(n-1)^2 - 1, a(0)=1, a(1)=5.A084765a(n) = 2*a(n-1)^2 - 1, a(0)=1, a(1)=5.Terms a(0) =1a(1) =5a(2) =49a(3) =4801a(4) =46099201External referencesoeis: A084765