Number of 5-element proper antichains of an n-element set.
A051305
Number of 5-element proper antichains of an n-element set.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =543a(6) =118629a(7) =12564636a(8) =907001550a(9) =51751693161
External references
- oeis: A051305