Number of 3-element intersecting families of an n-element set.

A051180

Number of 3-element intersecting families of an n-element set.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =13a(4) =222a(5) =2585a(6) =25830a(7) =238833a(8) =2111382a(9) =18142585a(10) =152937510a(11) =1271964353a(12) =10476007542a(13) =85662034185a(14) =696700867590

External references