Triangle read by rows: T(n,k) is the number of digraphs on n unlabeled nodes with k arcs and a global source (or sink), n >= 1, k = 0..(n-1)^2.
A350797
Triangle read by rows: T(n,k) is the number of digraphs on n unlabeled nodes with k arcs and a global source (or sink), n >= 1, k = 0..(n-1)^2.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =0a(5) =2a(6) =2a(7) =1a(8) =0a(9) =0a(10) =0a(11) =4a(12) =11a(13) =19a(14) =15a(15) =8a(16) =2a(17) =1a(18) =0a(19) =0a(20) =0a(21) =0a(22) =9a(23) =45a(24) =157a(25) =319a(26) =453a(27) =455a(28) =352a(29) =199
External references
- oeis: A350797