y''(x)=\frac{2 x y'(x)}{x^2-1}-\frac{y(x) \left(\left(x^2-1\right) x^2 (a-n) (a+n+1)+2 a x^2+n (n+1) \left(x^2-1\right)\right)}{x^2 \left(x^2-1\right)}