a(n) = A205497(2*n, n - 1). The central coefficients of the Eulerian zig-zag polynomials.

A373754

a(n) = A205497(2*n, n - 1). The central coefficients of the Eulerian zig-zag polynomials.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =31a(4) =623a(5) =20641a(6) =1019051a(7) =70148989a(8) =6421463423a(9) =754405836811

External references