Triangle read by rows: T(n,k) is the number of acyclic digraphs on n unlabeled nodes with k arcs and a global source and sink, n >= 1, k = 0..n*(n-1)/2.
A350491
Triangle read by rows: T(n,k) is the number of acyclic digraphs on n unlabeled nodes with k arcs and a global source and sink, n >= 1, k = 0..n*(n-1)/2.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =0a(5) =1a(6) =1a(7) =0a(8) =0a(9) =0a(10) =1a(11) =4a(12) =4a(13) =1a(14) =0a(15) =0a(16) =0a(17) =0a(18) =1a(19) =9a(20) =25a(21) =32a(22) =22a(23) =8a(24) =1a(25) =0a(26) =0a(27) =0a(28) =0a(29) =0
External references
- oeis: A350491