Number of covers of an unlabeled n-set such that every point of the set is covered by exactly 4 subsets of the cover and that intersection of every 4 subsets of the cover contains at most one point.
A058791
Number of covers of an unlabeled n-set such that every point of the set is covered by exactly 4 subsets of the cover and that intersection of every 4 subsets of the cover contains at most one point.
Terms
- a(0) =1a(1) =4a(2) =25a(3) =278a(4) =5532a(5) =200589a(6) =11662671a(7) =981458725a(8) =111213730857
External references
- oeis: A058791