Number of connected irreducible posets with n labeled points.

A046906

Number of connected irreducible posets with n labeled points.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =0a(4) =24a(5) =1080a(6) =52440a(7) =3281880a(8) =277953144a(9) =32418855000

External references