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 A288989 #17 Feb 26 2018 10:18:32
%S A288989 1,691,477481,329939371,227988105361,157539780804451,
%T A288989 108859988535875641,75222252078290067931,51978576186098436940321,
%U A288989 35917196144594019925761811,24818782535914467768701411401,17149778732316897228172675278091
%N A288989 Denominators of coefficients in expansion of E_14/E_12.
%H A288989 Seiichi Manyama, <a href="/A288989/b288989.txt">Table of n, a(n) for n = 0..200</a>
%e A288989 E_14/E_12 = 1 - 82104/691 * q - 181275671592/477481 * q^2 + 1327007921039904/329939371 * q^3 + 16726528971891002133912/227988105361 * q^4 + ... .
%t A288989 terms = 12;
%t A288989 E14[x_] = 1 - 24*Sum[k^13*x^k/(1 - x^k), {k, 1, terms}];
%t A288989 E12[x_] = 1 + (65520/691)*Sum[k^11*x^k/(1 - x^k), {k, 1, terms}];
%t A288989 E14[x]/E12[x] + O[x]^terms // CoefficientList[#, x]& // Denominator (* _Jean-François Alcover_, Feb 26 2018 *)
%Y A288989 Cf. A288472 (numerators).
%Y A288989 Cf. A029828, A058550 (E_14).
%K A288989 nonn,frac
%O A288989 0,2
%A A288989 _Seiichi Manyama_, Jun 21 2017