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Lecture notes by Herbert S. Wilf on generating combinatorial objects and Maple.
www.cis.upenn.edu
Maintained by Bill Chen.
www.combinatorics.net
Combinatorics section of the Front for the Mathematics ArXiv.
front.math.ucdavis.edu
Enumeration of the Binary Trees
A note on Catalan numbers by Ivan Galkin.
ulcar.uml.edu
The Combinatorial Object Server
Select a type together with specific parameter values and COS will return a list of all such combinatorial objects.
www.theory.csc.uvic.ca
Topics in Mathematics - Combinatorics
In the Mathematics Archive at UTK.
archives.math.utk.edu
With Applications in Computer Science by Stasys Jukna.
www.thi.informatik.uni-frankfurt.de
Encyclopedia of Combinatorial Structures
Searchable database of structures with specifications and counts.
algo.inria.fr
Algebraic Combinatorics via Finite Group Actions
A hypertext by A. Betten, H. Fripertinger and A. Kerber.
www.mathe2.uni-bayreuth.de
CATS: Combinatorial Algorithms Test Sets
Searchable index of problems, links and methodology maintained by the Association for Computing Machinery.
www.jea.acm.org
Various facts and figures about Venn diagrams by Frank Ruskey.
www.combinatorics.org
Theory of chord structures to create music through algorithms by Vladimir Ladma.
www.sweb.cz
Subfields in the AMS MSC 2000 classification 05.
www.ams.org
Brendan McKay's collection of miscellaneous tables in graph6 or sparse6 format.
cs.anu.edu.au
A catalogue of different types with applications to packing spheres by Neil Sloane and Gabriele Nebe.
www.research.att.com