-138240

Appears in sequences

• Triangle read by rows: T(n,k) = (-1)^k * n! * 2^(n-2*k) * binomial(n,k) * binomial(2*k,k) (0<=k<=n).at n=22A123516
• Expansion 1/(1-x^2*cotan(x)) = Sum_{n>=0} a(n)*x^n/(n)!^2.at n=6A199540
• Table read by rows. T(n, k) = [z^k] h(n, 1, z) where h(n, v, z) are the modified Lommel polynomials (A369117).at n=33A369585