Number of commutative semigroups of order <= n.
A118100
Number of commutative semigroups of order <= n.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =75a(5) =400a(6) =2543a(7) =19834a(8) =241639a(9) =11787482a(10) =3530717819
External references
- oeis: A118100