\[ \boxed { {\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left ( x \right ) +a{\frac {\rm d}{{\rm d}x}}y \left ( x \right ) +b{x}^{r} \left ( y \left ( x \right ) \right ) ^{n}=0} \]
Mathematica: cpu = 0.045006 (sec), leaf count = 26 \[ \text {DSolve}\left [a y'(x)+b x^r y(x)^n+y''(x)=0,y(x),x\right ] \]
Maple: cpu = 0.359 (sec), leaf count = 0 \[ \text {could not solve} \]