Number of set-systems covering a subset of {1..n} where every two covered vertices appear together in some edge (cointersecting).
A327039
Number of set-systems covering a subset of {1..n} where every two covered vertices appear together in some edge (cointersecting).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =88a(4) =25421a(5) =2077323118
External references
- oeis: A327039