a(n) = f(n)/f(n-2) where f(k) = A002665(k).A096407a(n) = f(n)/f(n-2) where f(k) = A002665(k).Terms a(0) =5a(1) =17a(2) =197a(3) =33857a(4) =1133938277External referencesoeis: A096407