Triangle T(n,k) of number of digraphs with a source and a sink on n unlabeled nodes and k arcs, k=0..n*(n-1).

A057278

Triangle T(n,k) of number of digraphs with a source and a sink on n unlabeled nodes and k arcs, k=0..n*(n-1).

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =0a(5) =0a(6) =1a(7) =4a(8) =4a(9) =1a(10) =1a(11) =0a(12) =0a(13) =0a(14) =1a(15) =11a(16) =31a(17) =45a(18) =38a(19) =27a(20) =13a(21) =5a(22) =1a(23) =1a(24) =0a(25) =0a(26) =0a(27) =0a(28) =1a(29) =23

External references