Irregular array, read by rows: T(n,k) is the number of labeled acyclic digraphs with n nodes and k arcs (n >= 0, 0 <= k <= n*(n-1)/2).
A081064
Irregular array, read by rows: T(n,k) is the number of labeled acyclic digraphs with n nodes and k arcs (n >= 0, 0 <= k <= n*(n-1)/2).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =6a(6) =12a(7) =6a(8) =1a(9) =12a(10) =60a(11) =152a(12) =186a(13) =108a(14) =24a(15) =1a(16) =20a(17) =180a(18) =940a(19) =3050a(20) =6180a(21) =7960a(22) =6540a(23) =3330a(24) =960a(25) =120a(26) =1a(27) =30a(28) =420a(29) =3600
External references
- oeis: A081064