\[ x^2 y''(x)-(x+4) x y'(x)+4 y(x)=0 \] ✓ Mathematica : cpu = 0.0134841 (sec), leaf count = 41
\[\left \{\left \{y(x)\to c_2 e^x x^4-\frac {1}{6} c_1 x \left (e^x x^3 \text {Ei}(-x)+x^2-x+2\right )\right \}\right \}\]
✓ Maple : cpu = 0.033 (sec), leaf count = 35
\[ \left \{ y \left ( x \right ) =x \left ( {{\rm e}^{x}}{\it Ei} \left ( 1,x \right ) {\it \_C2}\,{x}^{3}+{\it \_C1}\,{x}^{3}{{\rm e}^{x}}-{\it \_C2}\, \left ( {x}^{2}-x+2 \right ) \right ) \right \} \]