The Non-Backtracking Spectrum of the Universal Cover of a Graph
The non-bipartite integral graphs with spectral radius three
The Non-Commutative Cycle Lemma
The non-vanishing cohomology of Orlik-Solomon algebras
The nullity of unicyclic signed graphs
The number of "magic" squares and hypercubes
The number of 3-SAT functions
The number of bar{3}bar{1}542-avoiding permutations
The number of centered lozenge tilings of a symmetric hexagon
The number of cliques in graphs of given order and size
The number of convex pentagons and hexagons in an $n$-triangular net
The Number of Convex Polyominoes and the Generating Function of Jacobi Polynomials
The number of cycles of specified normalized length in permutations
The number of edge disjoint transitive triples in a tournament
The number of edges in critical strongly connected graphs
The number of edges in k-quasi-planar graphs
The number of equivalent realisations of a rigid graph
The number of extreme points of tropical polyhedra
The number of F-matchings in almost every tree is a zero residue
The number of faces of a simple polytope