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 A307759 #15 Apr 29 2019 21:14:00 %S A307759 0,654403831,-428244362959801779753,280244748103684391377173184156636, %T A307759 -183393234406846382045882997606216500971256873, %U A307759 120013233624492418923583549710011469008178874255627685075,-78537118839697516276808630128261511971322824900859081926520601647268 %N A307759 a(n) = -(A288261(5*n) - A288261(n))/3000. %H A307759 Seiichi Manyama, <a href="/A307759/b307759.txt">Table of n, a(n) for n = 0..84</a> %H A307759 MathOverflow, <a href="https://mathoverflow.net/questions/272928/">Properties of coefficients in expansion of E6/E4 and E8/E6</a> %Y A307759 Cf. A004009 (E_4), A013973 (E_6), A288261, A307760. %K A307759 sign %O A307759 0,2 %A A307759 _Seiichi Manyama_, Apr 26 2019