DiscreteMath`RSolve`
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:
Version 5.2
![<< DiscreteMath`RSolve`;
PowerSum[n^2, {x, n}]](Files/RSolve.en/legacy_1.gif)
Compute the general term in the series expansion of 
, using SeriesCoefficient:
Version 5.2
![<< DiscreteMath`RSolve`;
SeriesTerm[E^x, {x, 0, n}]](Files/RSolve.en/legacy_2.gif)
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.