a(2n) = -5*(fibonacci(6n+2))^2, a(2n+1) = (lucas(6n+5))^2.

A108791

a(2n) = -5*(fibonacci(6n+2))^2, a(2n+1) = (lucas(6n+5))^2.

Terms

    a(0) =-5a(1) =121a(2) =-2205a(3) =39601a(4) =-710645a(5) =12752041a(6) =-228826125a(7) =4106118241a(8) =-73681302245

External references