Posets with n points with property that there is no nonsingelton proper subset T for which x not in T implies x<T or x>T or x incomparable with every element of T.
A046905
Posets with n points with property that there is no nonsingelton proper subset T for which x not in T implies x<T or x>T or x incomparable with every element of T.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =0a(4) =24a(5) =360a(6) =17400a(7) =1066800
External references
- oeis: A046905