Number of asymmetric semigroups of order n with 1 idempotent.

A058114

Number of asymmetric semigroups of order n with 1 idempotent.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =11a(4) =112a(5) =4398a(6) =1181185

External references