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 A297383 #15 Feb 16 2025 08:33:52 %S A297383 1,372,923750400,45753948775891501056, %T A297383 117025810110454721307910368374292480 %N A297383 Number of Eulerian cycles in the n-cocktail party graph. %H A297383 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CocktailPartyGraph.html">Cocktail Party Graph</a> %H A297383 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/EulerianCycle.html">Eulerian Cycle</a> %K A297383 nonn,more %O A297383 2,2 %A A297383 _Eric W. Weisstein_, Dec 29 2017 %E A297383 a(4) from _Andrew Howroyd_, Jan 11 2018 %E A297383 a(5)-a(6) from _Max Alekseyev_, Feb 17 2024