New posts in Co.Combinatorics

Listing all posets on 9 points?

Decomposing square of side length $n$ into $n$ squares in a certain "maximal" way

Looking for a combinatorial proof for a Catalan identity

De Bruijn's sequence is odd iff $n=2^m-1$: Part I

Maximum number of vectors with upper bound on pairwise inner products

Can every involution of a symmetric directed graph be written as a power of another symmetry?

Product of two reflections lying in a parabolic subgroup of a Coxeter group

Counting monomials in product polynomials: Part I

Ehrhart period collapse for $123\ldots k$-avoiding Birkhoff polytope?

Alternative proofs sought after for a certain identity