Number of set-systems (without {}) on n vertices that are closed under intersection.
A326901
Number of set-systems (without {}) on n vertices that are closed under intersection.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =32a(4) =418a(5) =23702a(6) =16554476
External references
- oeis: A326901