125945

Appears in sequences

• Triangle T(n,k) of number of digraphs with a source and a sink on n labeled nodes and k arcs, k=0,1,..,n*(n-1).at n=36A057271
• Triangle T(n,k) of number of unilaterally connected digraphs on n labeled nodes and with k arcs, k=0..n*(n-1).at n=36A057275
• E.g.f.: A(x) = 1/[(1 - x^2)^(1 + 1/x)].at n=8A193281