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 A145269 #13 Feb 16 2025 08:33:09 %S A145269 0,0,0,0,0,1,14,222,5380,194815,10864252,1000316856,164757860141 %N A145269 Number of simple nonplanar graphs on n nodes. %H A145269 Slavik Jablan, Ljiljana Radovic, Radmila Sazdanovic (2011). Nonplanar graphs derived from Gauss codes of virtual knots and links, J. Math. Chem. 49(10), 2250-2267, DOI:<a href="http://dx.doi.org/10.1007/s10910-011-9884-6">10.1007/s10910-011-9884-6</a> %H A145269 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/NonplanarGraph.html">Nonplanar Graph</a> %F A145269 a(n) = A000088(n) - A005470(n). %Y A145269 Cf. A145270. %K A145269 nonn,more %O A145269 0,7 %A A145269 _Eric W. Weisstein_, Oct 05 2008 %E A145269 Edited by _Max Alekseyev_, Sep 18 2009 %E A145269 a(12) added by _Max Alekseyev_, Aug 17 2015