Number of irreducible or connected partial orders on {1,2,...,n} that are contained in the usual linear order (i.e., xRy => x < y).
A323502
Number of irreducible or connected partial orders on {1,2,...,n} that are contained in the usual linear order (i.e., xRy => x < y).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =18a(5) =181a(6) =2792a(7) =62960a(8) =2020256a(9) =90847421a(10) =5674075324a(11) =489320844468
External references
- oeis: A323502