Number of labeled semitransitive orders on n elements: (1+3)-free posets.

A079145

Number of labeled semitransitive orders on n elements: (1+3)-free posets.

Terms

    a(0) =1a(1) =3a(2) =19a(3) =195a(4) =2791a(5) =51423a(6) =1167979a(7) =32067675a(8) =1064281951a(9) =43806954183

External references