DSolve[Derivative[2][y][x] == -(((4*a*(a - n)*x^2 - (2*a + (-n + v)*(1 + n + v))*(-1 + x^2))*y[x])/(-1 + x^2)^2) - (2*(1 - 2*a + n)*x*Derivative[1][y][x])/(-1 + x^2),y[x],x]