77305

Appears in sequences

• Triangle of number of (weakly) connected unlabeled digraphs with n nodes and k arcs (n >=2, k >= 1).at n=50A054733
• a(n) = 6*binomial(n,4) + 5*binomial(n,2) - 4*n + 5.at n=24A066455
• Irregular triangular array read by rows: T(n,k) is the number of non-isomorphic unlabeled weakly connected digraphs on n nodes and with k arcs.at n=41A283753
• Number of Dyck paths of semilength n such that neighboring peaks differ in height by exactly one and first and last peak are at height one.at n=24A371727