Number of nonisomorphic commutative groupoids with no idempotents and a nontrivial symmetry.

A030262

Number of nonisomorphic commutative groupoids with no idempotents and a nontrivial symmetry.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =3a(4) =96a(5) =54248

External references