Number of self-converse semigroups of order n with 1 idempotent.

A058119

Number of self-converse semigroups of order n with 1 idempotent.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =18a(4) =93a(5) =930a(6) =22899

External references