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 A369821 #9 Jun 09 2025 21:01:19 %S A369821 0,1,16,10146816,24578010504157244424192000000 %N A369821 Number of (undirected) Eulerian cycles in the n-Dorogovtsev-Goltsev-Mendes graph. %C A369821 Using the convention that DGM(0) = P_2. %C A369821 Term a(5) has 101 decimal digits and a(6) has 331 decimal digits. - _Andrew Howroyd_, Jun 09 2025 %H A369821 Andrew Howroyd, <a href="/A369821/b369821.txt">Table of n, a(n) for n = 0..6</a> %H A369821 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Dorogovtsev-Goltsev-MendesGraph.html">Dorogovtsev-Goltsev-Mendes Graph</a>. %H A369821 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/EulerianCycle.html">Eulerian Cycle</a>. %Y A369821 Cf. A368190. %K A369821 nonn %O A369821 0,3 %A A369821 _Eric W. Weisstein_, Feb 02 2024 %E A369821 a(4) onwards from _Andrew Howroyd_, Jun 09 2025