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 A319115 #14 Feb 16 2025 08:33:56 %S A319115 0,0,0,0,1,13,207,5128 %N A319115 Number of simple connected toroidal graphs on n nodes. %C A319115 a(n) <= A145270(n). %C A319115 a(n) = A145270(n) for n < 8. %C A319115 a(8) = A145270(8) - 15 since there are 15 double-toroidal graphs on 8 nodes, all of which are connected. %H A319115 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ConnectedGraph.html">Connected Graph</a> %H A319115 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SimpleGraph.html">Simple Graph</a> %H A319115 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ToroidalGraph.html">Toroidal Graph</a> %Y A319115 Cf. A145270 (simple connected nonplanar graphs). %K A319115 nonn,more %O A319115 1,6 %A A319115 _Eric W. Weisstein_, Sep 10 2018