| Catalogue of Lattices | | A catalogue of different types with applications to packing spheres by Neil Sloane and Gabriele Nebe. |
| Combinatorial Data | | Brendan McKay's collection of miscellaneous tables in graph6 or sparse6 format. |
| Combinatorics | | MathWorld article with basic definitions and links. |
| East Side, West Side | | Lecture notes by Herbert S. Wilf on generating combinatorial objects and Maple. |
| 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. |
| Lectures in Combinatorics | | An introduction to partially ordered sets, Dilworth's theorem, lattices and combinatorial geometries. |
| Series Expansions | | Iwan Jensen counts polyominoes (aka lattice animals), paths, and various related quantities. | |
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