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East Side, West Side
Lecture notes by Herbert S. Wilf on generating combinatorial objects and Maple. (infos)The Combinatorics Net
Maintained by Bill Chen. (infos)
ArXiv Front: CO Combinatorics
Combinatorics section of the Front for the Mathematics ArXiv. (infos)
Enumeration of the Binary Trees
A note on Catalan numbers by Ivan Galkin. (infos)
The Combinatorial Object Server
Select a type together with specific parameter values and COS will return a list of all such combinatorial objects. (infos)
Topics in Mathematics - Combinatorics
In the Mathematics Archive at UTK. (infos)
Extremal Combinatorics
With Applications in Computer Science by Stasys Jukna. (infos)
Encyclopedia of Combinatorial Structures
Searchable database of structures with specifications and counts. (infos)
Algebraic Combinatorics via Finite Group Actions
A hypertext by A. Betten, H. Fripertinger and A. Kerber. (infos)
CATS: Combinatorial Algorithms Test Sets
Searchable index of problems, links and methodology maintained by the Association for Computing Machinery. (infos)