On an explicit representation of central $(2k+1)$-nomial coefficients
  We propose an explicit representation of central $(2k+1)$-nomial coefficients in terms of finite sums over trigonometric constructs. The approach utilizes the diagonalization of circulant boolean matrices and is generalizable to all $(2k+1)$-nomial coefficients, thus yielding a new family of combinatorical identities. 
Michelle Rudolph-Lilith and Lyle E. Muller
math.CO