Number of unlabeled semitransitive orders on n elements: (1+3)-free posets.
A079146
Number of unlabeled semitransitive orders on n elements: (1+3)-free posets.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =49a(5) =173a(6) =639a(7) =2469a(8) =9997a(9) =43109a(10) =205092a(11) =1153646a(12) =8523086a(13) =91156133a(14) =1446766659a(15) =32998508358
External references
- oeis: A079146