\[ y'(x) (a x+b+n)+a n y(x)+x y''(x)=0 \] ✓ Mathematica : cpu = 0.0486651 (sec), leaf count = 43
\[\left \{\left \{y(x)\to c_1 e^{-a x} U(b,b+n,a x)+c_2 e^{-a x} L_{-b}^{b+n-1}(a x)\right \}\right \}\] ✓ Maple : cpu = 0.204 (sec), leaf count = 31
\[\{y \left (x \right ) = \left (c_{1} \KummerM \left (b , b +n , a x \right )+c_{2} \KummerU \left (b , b +n , a x \right )\right ) {\mathrm e}^{-a x}\}\]