Number of unlabeled set-systems with {} that are closed under intersection and cover n vertices.
A326883
Number of unlabeled set-systems with {} that are closed under intersection and cover n vertices.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =22a(4) =302a(5) =28630a(6) =216533404
External references
- oeis: A326883