Various facts and figures about Venn diagrams by Frank Ruskey.

A hypertext by A. Betten, H. Fripertinger and A. Kerber.

Generators for several basic combinatorial objects by Frank Ruskey and Scott Lausch.

Combinatorics section of the Front for the Mathematics ArXiv.

Conference listings, bulletin and links maintained by Peter Cameron.

Committee for the Advancement of Discrete and Combinatorial Mathematics.

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

Searchable index of problems, links and methodology maintained by the Association for Computing Machinery.

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

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

Combinatorics throughout Australia, New Zealand and neighbouring countries.

Subfields in the AMS MSC 2000 classification 05.

Lecture notes by Herbert S. Wilf on generating combinatorial objects and Maple.

Searchable database of structures with specifications and counts.

A note on Catalan numbers by Ivan Galkin.

With Applications in Computer Science by Stasys Jukna.

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

About 40 "informal notes" on combinatorics by Kevin Brown.

An expanding web text by Joe Fields.

Research into the relations between algebra and combinatorics.

Provides an opportunity to unify pure discrete mathematics and areas of applied research.

Catalogues of the mathematical objects produced using LOWX.

Select a type together with specific parameter values and COS will return a list of all such combinatorial objects.

Maintained by Bill Chen.

An unsolved combinatorial problem by Frans Faase.

A project to develop a hypertext on major topics in combinatorics.

Comprehensive catalog of websites relating to Combinatorics.