Number of nonisomorphic semigroups of order n.

A027851

Number of nonisomorphic semigroups of order n.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =24a(4) =188a(5) =1915a(6) =28634a(7) =1627672a(8) =3684030417

External references