Number of labeled totally ordered semigroups with n elements.

A084965

Number of labeled totally ordered semigroups with n elements.

Terms

    a(0) =1a(1) =1a(2) =6a(3) =44a(4) =386a(5) =3852a(6) =42640a(7) =516791a(8) =6817378a(9) =98091071a(10) =1569786228

External references