Number of unlabeled, non-connected or empty antichains of nonempty subsets of {1..n}.
A327424
Number of unlabeled, non-connected or empty antichains of nonempty subsets of {1..n}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =33a(6) =234a(7) =16579
External references
- oeis: A327424