On the number of distributive lattices.
On the Number of Faces of Simplicial Complexes and the Purity of Frobenius.
On the number of fully packed loop configurations with a fixed associated matching.
On the number of genus one labeled circle trees.
On the number of intervals in Tamari lattices. (Sur le nombre d'intervalles dans les treillis de Tamari.)
On the number of labeled -arch graphs.
On the number of matchings in regular graphs.
On the number of monotonic functions from two-valued logic to -valued logic
On the number of m-term zero-sum subsequences
On the number of non-isomorphic Steiner triples
On the number of pairs of partitions of n without common subsums
On the number of permutations admitting an th root.
On the number of permutations arising from a problem in cell-biology.
On the number of planar orientations with prescribed degrees.
On the number of possible row and column sums of -matrices.
On the number of prime divisors of a binomial coefficient.
On the number of rim hook tableaux
On the number of subsets relatively prime to an integer.
On the order of lacunary sums of binomial coefficients.
On the parity of the number of multiplicative partitions