Number of composite unlabeled topologies (i.e., composite homeomorphism classes) on n points.

A028849

Number of composite unlabeled topologies (i.e., composite homeomorphism classes) on n points.

Terms

    a(0) =0a(1) =0a(2) =6a(3) =0a(4) =27a(5) =0a(6) =91a(7) =45a(8) =417a(9) =0

External references