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 A282031 #9 Jun 23 2018 12:52:24 %S A282031 1,3,9,-15,21,18,-45,24,45,-69,54,36,-105,42,72,-90,93,54,-207,60,126, %T A282031 -120,108,72,-225,93,126,-231,168,90,-270,96,189,-180,162,144,-483, %U A282031 114,180,-210,270,126,-360,132,252,-414,216,144,-465,171,279,-270,294,162,-693,216,360,-300,270,180 %N A282031 Coefficients in q-expansion of (9*E_2(q^3)-E_2(q))/8. %H A282031 H Movasati, Y Nikdelan, <a href="http://arxiv.org/abs/1603.09411">Gauss-Manin Connection in Disguise: Dwork Family</a>, arXiv preprint arXiv:1603.09411, 2016. See t_2(q) in (1.11), also Table 1. %F A282031 Conjecture: -3 A122858(n) - A229616(n) + 4 A282031(n) = 0 for all n. - _Thomas Baruchel_, Jun 23 2018 %Y A282031 See A006352 for E_2. %K A282031 sign %O A282031 0,2 %A A282031 _N. J. A. Sloane_, Feb 19 2017