Below are some useful links:

• WZ in Ten Minutes
  
• A front end to the archive of mathematical preprints.
• AMS Home Page, inparticular MathSciNet and Mathematics Subject Classification.
• Doron Zeilberger's home page
• Herbert Wilf's Home Page
• Richard Stanley's Home Page
• The Electronic Journal of Combinatorics
• Eric Weisstein's MathWorld
• Steve Finch's page of Favorite Mathematical Constants
• Sloan's on-line Encyclopedia of Integer Sequences.
• The home page of The MIT Mathematics Department.
• Algorithmic Combinatorics Group at RISC and Algorithms Project at INRIA-Paris.
• A homepage of Combinatorics and related conferences.
• Home pages of combinatorial people and Who's who in combinatorics

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