Number of prime unlabeled connected topologies (i.e., prime connected homeomorphism classes) on n points.
A028857
Number of prime unlabeled connected topologies (i.e., prime connected homeomorphism classes) on n points.
Terms
- a(0) =2a(1) =6a(2) =18a(3) =94a(4) =500a(5) =3485
External references
- oeis: A028857