Number of 5-element families of an n-element set such that every 3 members of the family have a nonempty intersection.
A051364
Number of 5-element families of an n-element set such that every 3 members of the family have a nonempty intersection.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =225a(5) =21571a(6) =1174122a(7) =51441824a(8) =2038356243a(9) =76714338477
External references
- oeis: A051364