Number of labeled n-element posets with no 3-element antichain.
A080687
Number of labeled n-element posets with no 3-element antichain.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =18a(4) =174a(5) =2370a(6) =41850a(7) =908460a(8) =23393160a(9) =696752280a(10) =23558056200a(11) =891259815600
External references
- oeis: A080687