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 A387066 #9 Aug 18 2025 00:38:56 %S A387066 1,4,21,191,3338,115438 %N A387066 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 of genus n (that is, no proper subset of the embedding separates the genus n surface) but not the surface of genus n-1. %C A387066 n is called the least separating genus. %D A387066 C. N. Aagaard and J. J. P. Veerman, Classification of Minimal Separating Sets of Low Genus Surfaces, Topology and its Applications, Accepted, 2025. %D A387066 J. Bernhard and J. J. P. Veerman, The Topology of Surface Mediatrices, Topology and its Applications, 154, 54-68, 2007. %e A387066 For genus 0: only the circle. %e A387066 For genus 1: 2 circles, bouquet of 2 circles, bouquet of 3 circles, 4-fold multi-edge. %Y A387066 Cf. A384639, A387067, A387068. %K A387066 nonn,more %O A387066 0,2 %A A387066 _J. J. P. Veerman_, Aug 15 2025