Number of 7-element proper antichains of an n-element set.

A051307

Number of 7-element proper antichains of an n-element set.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =135a(6) =329205a(7) =365924948a(8) =205640068950

External references