Number of topologies on n labeled elements in which no element belongs to any pair of noncomparable members of the topology.
A122835
Number of topologies on n labeled elements in which no element belongs to any pair of noncomparable members of the topology.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =19a(4) =112a(5) =811a(6) =7024a(7) =70939a(8) =818752a(9) =10630891a(10) =153371344a(11) =2433948859a(12) =42137351392a(13) =790287522571
External references
- oeis: A122835