Number of ordered oriented multigraphs on n labeled arcs (with loops).

A020561

Number of ordered oriented multigraphs on n labeled arcs (with loops).

Terms

    a(0) =1a(1) =2a(2) =17a(3) =252a(4) =5535a(5) =165278a(6) =6355147a(7) =303080956a(8) =17440307953

External references