Number of self-converse monoids (semigroups with identity) of order n.

A058132

Number of self-converse monoids (semigroups with identity) of order n.

Terms

    a(0) =0a(1) =1a(2) =2a(3) =5a(4) =19a(5) =84a(6) =509a(7) =3901a(8) =48957

External references