\[ 4 x^3 y'(x)+4 x^2 y''(x)+\left (x^2-4\right ) \left (x^2+6\right ) y(x)=0 \] ✓ Mathematica : cpu = 0.0229422 (sec), leaf count = 32
\[\left \{\left \{y(x)\to \frac {e^{-\frac {x^2}{4}} \left (c_2 x^5+5 c_1\right )}{5 x^2}\right \}\right \}\]
✓ Maple : cpu = 0.089 (sec), leaf count = 21
\[ \left \{ y \left ( x \right ) ={\frac {{\it \_C2}\,{x}^{5}+{\it \_C1}}{{x}^{2}}{{\rm e}^{-{\frac {{x}^{2}}{4}}}}} \right \} \]