Resources for learning generating functions

[Fisicks]

Does anyone know of resources for an intro to generating functions? My number theory book just threw it out there. Thanks in advance.

 

[Edgardo]

I like http://foxmath.wordpress.com/2008/01/08/generating-functions/".

 

[0xDEADBEEF]

Perfect source

'nuff said:
http://www.math.upenn.edu/~wilf/DownldGF.html

 

[Fisicks]

I like http://foxmath.wordpress.com/2008/01/08/generating-functions/".

Very very good sir, just what i needed. Many thanks