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).

A057271

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).

Terms

    a(0) =1a(1) =0a(2) =2a(3) =1a(4) =0a(5) =0a(6) =6a(7) =20a(8) =15a(9) =6a(10) =1a(11) =0a(12) =0a(13) =0a(14) =24a(15) =234a(16) =672a(17) =908a(18) =792a(19) =495a(20) =220a(21) =66a(22) =12a(23) =1a(24) =0a(25) =0a(26) =0a(27) =0a(28) =120a(29) =2544

External references