Number of labeled idempotent monoids of order n.

A351731

Number of labeled idempotent monoids of order n.

Terms

    a(0) =1a(1) =2a(2) =12a(3) =140a(4) =3020a(5) =100362a(6) =4768624a(7) =305498328a(8) =25293331098

External references