Number of unlabeled digraphs with loops (relations) on n nodes and with an even number of arcs.
A055973
Number of unlabeled digraphs with loops (relations) on n nodes and with an even number of arcs.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =52a(4) =1540a(5) =145984a(6) =48467296a(7) =56141454464
External references
- oeis: A055973