\[ (x+3) x^2 y^{(3)}(x)-3 (x+2) x y''(x)+6 (x+1) y'(x)-6 y(x)=0 \] ✓ Mathematica : cpu = 0.0306557 (sec), leaf count = 65
\[\left \{\left \{y(x)\to \frac {1}{4} c_1 \left (x^3-3 x^2+3 x+3\right )+\frac {1}{2} c_2 \left (-x^3+3 x^2-x-1\right )+\frac {1}{8} c_3 \left (3 x^3-5 x^2+x+1\right )\right \}\right \}\]
✓ Maple : cpu = 0.24 (sec), leaf count = 20
\[ \left \{ y \left ( x \right ) ={\it \_C1}\,{x}^{2}+{x}^{3}{\it \_C2}+{\it \_C3}\, \left ( 1+x \right ) \right \} \]