Number of directed 3-regular graphs on n nodes without directed 2-cycles.
A219895
Number of directed 3-regular graphs on n nodes without directed 2-cycles.
Terms
- a(0) =3a(1) =26a(2) =1547a(3) =146487a(4) =16018987a(5) =1985766270a(6) =278601715904
External references
- oeis: A219895