Number of sets of subsets of {1..n} covering all n vertices whose dual is a (strict) antichain, also called covering T_1 sets of subsets.
A326960
Number of sets of subsets of {1..n} covering all n vertices whose dual is a (strict) antichain, also called covering T_1 sets of subsets.
Terms
- a(0) =2a(1) =2a(2) =4a(3) =72a(4) =38040a(5) =4020463392
External references
- oeis: A326960