462638

Appears in sequences

• a(n) = A027113(n, 2n-1).at n=13A027119
• Number of equivalence classes (up to homeomorphism) of finite, connected ribbon graphs that have an embedding in an orientable surface of genus n which minimally separates the surface of genus n (that is, no proper subset of the embedding separates the genus n surface) but not the surface of genus n-1.at n=4A387068