The functionality is now available in built-in Mathematica kernel functions RSolve, ZTransform, and Sum.
The built-in kernel function SeriesCoefficient now contains the functionality for SeriesTerm.
Compute the generating function of the sequence of squares of integers using Sum:
Compute the general term in the series expansion of , using SeriesCoefficient:
ExponentialPowerSum, HSolve, ISolve, PartialFractions, and PowerSum were available in previous versions of Mathematica and are now available on the web at library.wolfram.com/infocenter/MathSource/6825.