Number of cyclic oriented multigraphs on n labeled arcs (without loops).

A020564

Number of cyclic oriented multigraphs on n labeled arcs (without loops).

Terms

    a(0) =1a(1) =1a(2) =7a(3) =88a(4) =1686a(5) =44746a(6) =1550780a(7) =67381560a(8) =3562868722a(9) =224113484498

External references