This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A384639 #59 Aug 19 2025 16:36:05 %S A384639 1,5,26,217,3555,118993 %N A384639 Number of equivalence classes (up to graph homeomorphism) of finite graphs that have an embedding in an orientable surface of genus n which minimally separates the surface (that is, no proper subset of the embedding separates the genus n surface). %D A384639 C. N. Aagaard and J. J. P. Veerman, Classification of Minimal Separating Sets of Low Genus Surfaces, Topology and its Applications, Accepted, 2025. %D A384639 J. Bernhard and J. J. P. Veerman, The Topology of Surface Mediatrices, Topology and its Applications, 154, 54-68, 2007. %e A384639 For genus 0: only the circle. %e A384639 For genus 1: 1 circle, 2 circles, bouquet of 2 circles, bouquet of 3 circles, 4-fold multi-edge. %Y A384639 Cf. A387066, A387067, A387068. %K A384639 more,nonn %O A384639 0,2 %A A384639 _J. J. P. Veerman_, Aug 13 2025