9.19   ODE No. 1855

$$\boxed{{\displaystyle \frac{{\mathrm{d}}^n}{\mathrm{d}{x}^n}y\left(x\right)=f\left(\frac{{\mathrm{d}}^{n-2}}{\mathrm{d}{x}^{n-2}}y\left(x\right)\right)=0}}$$

1. Problem in Latex
2. Mathematica input
3. Maple input

Mathematica: cpu = 0 (sec), leaf count = 1 $$\text{not solved}$$

Maple: cpu = 0.515 (sec), leaf count = 0 $$\text{could not solve}$$