Number of topologies, or transitive digraphs with n unlabeled nodes.

A001930

Number of topologies, or transitive digraphs with n unlabeled nodes.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =139a(6) =718a(7) =4535a(8) =35979a(9) =363083a(10) =4717687a(11) =79501654a(12) =1744252509a(13) =49872339897

External references