Number of directed multigraphs with loops on an infinite set of nodes containing a total of n arcs.
A052171
Number of directed multigraphs with loops on an infinite set of nodes containing a total of n arcs.
Terms
- a(0) =1a(1) =2a(2) =11a(3) =52a(4) =296a(5) =1724a(6) =11060a(7) =74527a(8) =533046a(9) =3999187a(10) =31412182a(11) =257150093a(12) =2188063401a(13) =19299062896a(14) =176059781439
External references
- oeis: A052171