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 A222198 #10 Feb 17 2021 11:10:37 %S A222198 6,28,84,257,856,2785 %N A222198 Order of linear recurrence for number of Hamiltonian cycles in the graph C_n X C_k as a function of k. %H A222198 Artem M. Karavaev, <a href="https://web.archive.org/web/20161024010518/http://flowproblem.ru/cycles/hamilton-cycles">Hamilton Cycles</a> %Y A222198 Cf. A222199. %K A222198 nonn,more %O A222198 3,1 %A A222198 _N. J. A. Sloane_, Feb 14 2013