Number of partially ordered sets with no isolated points and with n "lines": pairs (a,b) where a < b and there is no c with a < c < b. The lines form the minimal basis for the partial ordering.
A022016
Number of partially ordered sets with no isolated points and with n "lines": pairs (a,b) where a < b and there is no c with a < c < b. The lines form the minimal basis for the partial ordering.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =47a(5) =174a(6) =749a(7) =3291a(8) =15675a(9) =78104a(10) =411042a(11) =2261961a(12) =13009112a(13) =77860234
External references
- oeis: A022016