Number of isomorphism classes of commutative monoids (commutative semigroups with identity) of order n.
A058131
Number of isomorphism classes of commutative monoids (commutative semigroups with identity) of order n.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =5a(4) =19a(5) =78a(6) =421a(7) =2637a(8) =20486a(9) =246458a(10) =11833361
External references
- oeis: A058131