ArXiv Front: CO Combinatorics - Combinatorics section of the Front for the Mathematics ArXiv.
Enumeration of the Binary Trees - A note on Catalan numbers by Ivan Galkin.
The Combinatorial Object Server - Select a type together with specific parameter values and COS will return a list of all such combinatorial objects.
Topics in Mathematics - Combinatorics - In the Mathematics Archive at University of Tennessee, Knoxville.
Extremal Combinatorics - With Applications in Computer Science by Stasys Jukna.
Encyclopedia of Combinatorial Structures - Searchable database of structures with specifications and counts.
Algebraic Combinatorics via Finite Group Actions - A hypertext by A. Betten, H. Fripertinger and A. Kerber.
CATS: Combinatorial Algorithms Test Sets - Searchable index of problems, links and methodology maintained by the Association for Computing Machinery.
A Survey of Venn Diagrams - Various facts and figures about Venn diagrams by Frank Ruskey.
G-Systems - Theory of chord structures to create music through algorithms by Vladimir Ladma.
Combinatorics - Subfields in the AMS MSC 2000 classification 05.
Combinatorial Data - Brendan McKay's collection of miscellaneous tables in graph6 or sparse6 format.
Catalogue of Lattices - A catalogue of different types with applications to packing spheres by Neil Sloane and Gabriele Nebe.
The Math Forum Math Library - Combinatorics - Comprehensive catalog of websites relating to Combinatorics.
Generating Functions - Introduction to generating functions with interactive java applets by Alexander Bogomolny.
Combinatorial Catalogues - Combinatorial objects such as graphs, designs and geometries collected by Gordon Royle.
On-line Dictionary of Combinatorics - An expanding web text by Joe Fields.
Series Expansions - Iwan Jensen counts polyominoes (aka lattice animals), paths, and various related quantities.
Lectures in Combinatorics - An introduction to partially ordered sets, Dilworth's theorem, lattices and combinatorial geometries.
The Cutting Sticks Problem - An unsolved combinatorial problem by Frans Faase.
Combinatorics - MathWorld article with basic definitions and links.
Four Colour Theorem - A new proof of the four color theorem by Ashay Dharwadker that uses group theory and Steiner systems.
Polya's Enumeration Theorem - An article on generating functions and Polya's theory of counting by Karl Dahlke.
Counting Young Tableaux - An article on counting Young tableaux of bounded height by François Bergeron and Francis Gascon.
Squared Squares - Tilings of squares and rectangles, the classical problem and variations.
Four Color Theorem: A Brief Historical Insight - An essay by Dominic Verderaime.
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