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Hello, I have a little problem with the RSolve function. I want to solve an Ordinary differential equation, a quiet difficult, with a development in series. My equation : R''[r]+(E-l*(l+1)/r^2-beta*r^(1/3))*R[r]==0 where E, l and beta are constant. Anybody knows how to proceed with Rsolve to calculate the generating element a[n] of the development : Sum[a[n]*r^n,n] Thanks a lot. Christophe.