Number of commutative monoids of order n with 2 idempotents.
A058143
Number of commutative monoids of order n with 2 idempotents.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =26a(4) =98a(5) =455a(6) =4018a(7) =101910a(8) =10054303
External references
- oeis: A058143