Number of connected partially ordered sets with n unlabeled elements.

A000608

Number of connected partially ordered sets with n unlabeled elements.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =10a(5) =44a(6) =238a(7) =1650a(8) =14512a(9) =163341a(10) =2360719a(11) =43944974a(12) =1055019099a(13) =32664984238

External references