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 A007688 M3514 #18 Aug 26 2022 19:55:36 %S A007688 4,16,52,144,420,816,1732,3508,7060,18640 %N A007688 Number of 5-colorings of cyclic group of order n. %D A007688 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A007688 R. Haas, <a href="https://doi.org/10.2307/2690938">Three-colorings of finite groups or an algebra of nonequalities</a>, Math. Mag., 63 (1990), 211-225. %H A007688 R. Haas, <a href="/A007687/a007687.pdf">Letter to N. J. A. Sloane, Aug. 1994</a> %Y A007688 Cf. A007687. %K A007688 nonn,more %O A007688 1,1 %A A007688 _N. J. A. Sloane_ %E A007688 a(6)-a(10) from _Andrey Zabolotskiy_, Jul 12 2017