\[ y''(x)-\left (x^2+1\right ) y(x)=0 \] ✓ Mathematica : cpu = 0.00806392 (sec), leaf count = 33
\[\left \{\left \{y(x)\to c_1 D_{-1}\left (\sqrt {2} x\right )+c_2 D_0\left (i \sqrt {2} x\right )\right \}\right \}\]
✓ Maple : cpu = 0.035 (sec), leaf count = 23
\[ \left \{ y \left ( x \right ) ={\it \_C1}\,{{\rm e}^{{\frac {{x}^{2}}{2}}}}+{\it \_C2}\,{{\rm e}^{{\frac {{x}^{2}}{2}}}}{\it Erf} \left ( x \right ) \right \} \]