56294

Appears in sequences

• Triangle read by rows: T(n,k) = number of labeled digraphs with n nodes and k arcs and without directed paths of length >=2, with 0 <= k <= floor(n^2/4).at n=35A052296
• Expansion of e.g.f.: cosh(x)/(1-x)^2.at n=7A088128
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.at n=20A147329
• Number of n X 5 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 0 1 and 1 1 0 vertically.at n=8A207935