Non-Contiguous Pattern Avoidance in Binary Trees

Non-Convexity

Non-crossing Knight's Tour in 3-Dimension

Non-crossing partitions, non-nesting partitions and Coxeter sortable elements in types A and B

Non-Crossing Tableaux

Non-degenerate colorings in the Brook's Theorem

Non-degenerated groundstates in the antiferromagnetic Ising model on triangulations

Non-Generic Tropical Hyperplane Arrangements and the Secondary polytope of $Δ_{n-1} \times Δ_{d-1}$

Non-Holonomicity of Sequences Defined via Elementary Functions

Non-holonomicity of the sequence $\log 1, \log 2, \log 3, ...$

Non-linear Recurrences that Quite Unexpectedly Generate Rational Numbers

Non-orientable quasi-trees for the Bollobas-Riordan polynomial

Non-representability of finite projective planes by convex sets

Non-Symmetric Hall-Littlewood Polynomials

Non-three-colorable common graphs exist

Non-trivial Compositions of Differential Operations and Directional Derivative

Non-unique factorizations, land surveying and electricity

Nonattacking Queens in a Rectangular Strip

Noncommutative algebras related with Schubert calculus on Coxeter groups

Noncommutative Analogs of Monomial Symmetric Functions, Cauchy Identity, and Hall Scalar Product