By Ashay Dharwadker. Includes profile, research papers for other algorithms, lecture notes, and student database.

Various facts and figures about Venn diagrams by Frank Ruskey.

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

Combinatorics section of the Front for the Mathematics ArXiv.

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.

Subfields in the AMS MSC 2000 classification 05.

MathWorld article with basic definitions and links.

An article on counting Young tableaux of bounded height by François Bergeron and Francis Gascon.

Searchable database of structures with specifications and counts.

Enumeration of polyhedra with upto 9 faces by Steven Dutch.

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.

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

An introduction to partially ordered sets, Dilworth's theorem, lattices and combinatorial geometries.

An expanding web text by Joe Fields.

An article on generating functions and Polya's theory of counting by Karl Dahlke.

Iwan Jensen counts polyominoes (aka lattice animals), paths, and various related quantities.

Tilings of squares and rectangles, the classical problem and variations.

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.