38580030720domain: NAppears in sequencesa(n) = F(4)*F(n)*F(n+1) + F(5)*F(n+1)^2 if n odd, a(n) = F(4)*F(n)*F(n+1) + F(5)*F(n+1)^2 - F(5) if n even, where F(n) is the n-th Fibonacci number (A000045).at n=24A080144a(n) = F(n)^2 + 4*(-1)^n = F(n+3)*F(n-3), where F = A000045.at n=27A292612