Question Number 135778 by mathmax by abdo last updated on 15/Mar/21
$$\mathrm{find}\:\:\mathrm{u}_{\mathrm{n}} \left(\mathrm{x}\right)\mathrm{if}\:\:\mathrm{u}_{\mathrm{n}} \left(\mathrm{x}\right)+\mathrm{u}_{\mathrm{n}+\mathrm{1}} \left(\mathrm{x}\right)=\frac{\mathrm{x}^{\mathrm{n}} }{\mathrm{n}!} \\ $$