Algebraic Combinatorics via Finite Group Actions
A hypertext by A. Betten, H. Fripertinger and A. Kerber.

ArXiv Front: CO Combinatorics
Combinatorics section of the Front for the Mathematics ArXiv.

Catalogue of Lattices
A catalogue of different types with applications to packing spheres by Neil Sloane and Gabriele Nebe.

CATS: Combinatorial Algorithms Test Sets
Searchable index of problems, links and methodology maintained by the Association for Computing Machinery.

Combinatorial Catalogues
Combinatorial objects such as graphs, designs and geometries collected by Gordon Royle.

Combinatorial Data
Brendan McKay's collection of miscellaneous tables in graph6 or sparse6 format.

Combinatorics
Subfields in the AMS MSC 2000 classification 05.

Combinatorics
MathWorld article with basic definitions and links.

East Side, West Side
Lecture notes by Herbert S. Wilf on generating combinatorial objects and Maple.

Encyclopedia of Combinatorial Structures
Searchable database of structures with specifications and counts.

Enumeration of the Binary Trees
A note on Catalan numbers by Ivan Galkin.

Extremal Combinatorics
With Applications in Computer Science by Stasys Jukna.

G-Systems
Theory of chord structures to create music through algorithms by Vladimir Ladma.

Generating Functions
Introduction to generating functions with interactive java applets by Alexander Bogomolny.

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