Number of T_0 set-systems covering n vertices that are closed under intersection.
A309615
Number of T_0 set-systems covering n vertices that are closed under intersection.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =12a(4) =232a(5) =19230a(6) =16113300
External references
- oeis: A309615