Question: Rewriting a polynomial elegantly


> x[n]:=e[n]+w;
> f(w):=0;
> fxn:=convert(series(f(x[n]),e[n]=0,10),polynom);

How I can rewrite fxn so that every (1/k!)f^(k)(w)/f^(1)(w) for k=2,3,... is automatically replaced with c_{k}?

Here bracketed superscript denotes order of differentiation.

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