Number of unlabeled directed graphs with n arcs and no isolated vertices.
A053418
Number of unlabeled directed graphs with n arcs and no isolated vertices.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =80a(5) =365a(6) =1981a(7) =11222a(8) =69511a(9) =455663a(10) =3169244a(11) =23170347a(12) =177513359a(13) =1418920570a(14) =11798710013a(15) =101778754655a(16) =908722427531
External references
- oeis: A053418