Number of partial orders on {1,2,...,n} that are contained in the usual linear order, whose dual is given by the relabelling k -> n+1-k.
A383370
Number of partial orders on {1,2,...,n} that are contained in the usual linear order, whose dual is given by the relabelling k -> n+1-k.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =12a(5) =25a(6) =172a(7) =482a(8) =5318a(9) =19675a(10) =333768a(11) =1609846a(12) =40832554a(13) =254370640a(14) =9459449890a(15) =75546875426
External references
- oeis: A383370