Enumeration of integral tetrahedra.
Enumeration of Lattice paths and generating functions for skew plane partitions.
Enumeration of Pairs of Sequences by Rises, Falls and Levels.
Enumeration of partitions by long rises, levels, and descents.
Enumeration of perfect matchings of a type of quadratic lattice on the torus.
Enumeration of permutations by rises and cycle structure.
Enumeration of permutations with restricted subsequences. (Enumération de permutations à motifs exclus.)
Enumeration of pin-permutations.
Enumeration of sequences constrained by the ratio of consecutive parts.
Enumeration of symmetric arrays with different row sums
Enumeration of the partitions of an integer into parts of a specified number of different sizes and especially two sizes.
Enumeration of unigraphical partitions.
Enumeration of Up-Down Permutations by Upper Records.
Enumeration of Varlet and Comer hypergroups.
Enumeration schemes for permutations avoiding barred patterns.
Enumeration schemes for words avoiding patterns with repeated letters.
Enumeration under group action
Enumerative problems inspired by Mayer's theory of cluster integrals.
Enumerative properties of generalized associahedra.
Equations and inequalities involving .