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 A301748 #9 Feb 16 2025 08:33:53 %S A301748 5,12,25,51,81,155,221,376,445,782,953,1457,1697,2501,2467,4030,4501, %T A301748 6176,6821,9087,9025,12927,13989,17876,19181,24130,21481,31901,33857, %U A301748 41417,43793,52922,52957,66676,69997,82955,86801,102051,97735,124272,129405,149942,155849 %N A301748 Number of faces in the n-polygon diagonal intersection graph. %H A301748 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Face.html">Face</a> %H A301748 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PolygonDiagonalIntersectionGraph.html">Polygon Diagonal Intersection Graph</a> %F A301748 a(n) = 2-A007569(n)+A135565(n) (by the polyhedral formula). %Y A301748 Cf. A007569 (vertex count). %Y A301748 Cf. A135565 (edge count). %K A301748 nonn %O A301748 4,1 %A A301748 _Eric W. Weisstein_, Mar 26 2018