Number of connected labeled 2-regular pseudodigraphs (multiple arcs and loops allowed) of order n.
A123543
Number of connected labeled 2-regular pseudodigraphs (multiple arcs and loops allowed) of order n.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =14a(4) =201a(5) =4704a(6) =160890a(7) =7538040a(8) =462869190a(9) =36055948320
External references
- oeis: A123543