29472399505domain: NAppears in sequencesa(n) = Fibonacci(n)*(2*Fibonacci(n)-1).at n=26A095122a(n)=2*Product[(1 + 4*Cos[k*Pi/n]^2)*(1 + 4*Sin[k*Pi/n]^2), {k, 1, Floor[(n - 1)/2]}] - Product[(1 + 4*Sin[k*Pi/n]^2), {k, 1, Floor[(n - 1)/2]}].at n=26A152190