Number of labeled idempotent semigroups of order n.
A351730
Number of labeled idempotent semigroups of order n.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =35a(4) =604a(5) =16727a(6) =681232a(7) =38187291a(8) =2810370122a(9) =261999605819
External references
- oeis: A351730