167900

Appears in sequences

• Triangular array giving number of labeled digraphs on n unisolated nodes and k=0..n*(n-1) arcs.at n=35A054547
• Triangle T(n,k) of number of digraphs with a quasi-source on n labeled nodes and with k arcs, k=0,1,..,n*(n-1).at n=35A057272
• Triangular array T(n,k) giving number of weakly connected digraphs with n labeled nodes and k arcs (n >= 1, 0 <= k <= n(n-1)).at n=35A062735
• a(n) = n*(n-1)*(n-2)*(3*n-2)/6.at n=25A096200