* Binomial coefficients and Pascal's triangle
* Calculus of finite differences
* Stirling numbers and Bell numbers
* Fibonacci numbers and linear recurrences
* Rational and algebraic generating functions, with applications to probability
* Continued fractions and continuants
* Catalan objects and lattice animals
* Transfer matrices
* Partitions and compositions
* Combinatorial reciprocity theorems
* q-enumeration and tiling
* Determinants and condensation, number walls, and frieze patterns
* Signed enumeration and applications (the theorems of Vandermonde, Cayley-Hamilton, and Gessel-Viennot)
Maintained by Jim Propp.
Last updated September 3, 2001.