Number of directed 2-regular graphs on n nodes without directed 2-cycles.

A219894

Number of directed 2-regular graphs on n nodes without directed 2-cycles.

Terms

    a(0) =1a(1) =4a(2) =9a(3) =55a(4) =453a(5) =4357a(6) =47598a(7) =569769a(8) =7371560a(9) =102525991a(10) =1525164223

External references