Combinatorics
A Survey of Venn Diagrams
Various facts and figures about Venn diagrams by Frank Ruskey.
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.
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.
Extremal Combinatorics
With Applications in Computer Science by Stasys Jukna.
Generating Functions
Introduction to generating functions with interactive java applets by Alexander Bogomolny.
Lectures in Combinatorics
An introduction to partially ordered sets, Dilworth's theorem, lattices and combinatorial geometries.
Operational Research Programming Trivia
Computer code for research algorithms in operational research and combinatorial optimization.
Series Expansions
Iwan Jensen counts polyominoes (aka lattice animals), paths, and various related quantities.
The Combinatorial Object Server
Select a type together with specific parameter values and COS will return a list of all such combinatorial objects.
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