Number of unlabeled directed graphs on n nodes without a subgraph isomorphic to directed K_{2,2} that have the maximal number of edges (=A191873(n)).
A351335
Number of unlabeled directed graphs on n nodes without a subgraph isomorphic to directed K_{2,2} that have the maximal number of edges (=A191873(n)).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =6a(5) =5a(6) =4a(7) =829a(8) =707a(9) =2938a(10) =55779a(11) =60084
External references
- oeis: A351335