Row sums of A139621, number of connected directed multigraphs with loops and no vertex of degree 0, with n arcs.
A137975
Row sums of A139621, number of connected directed multigraphs with loops and no vertex of degree 0, with n arcs.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =32a(4) =167a(5) =928a(6) =5924a(7) =40211a(8) =293370a(9) =2255406a(10) =18201706a(11) =153176115a(12) =1339271815a(13) =12124484941a(14) =113362749476
External references
- oeis: A137975