Number of finite, negative, Archimedean, commutative, totally ordered monoids of size n (semi-groups with a neutral element that is also the top element).
A253948
Number of finite, negative, Archimedean, commutative, totally ordered monoids of size n (semi-groups with a neutral element that is also the top element).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =22a(6) =95a(7) =471a(8) =2670a(9) =17387a(10) =131753a(11) =1184059a(12) =12896589
External references
- oeis: A253948