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 A285991 #11 Apr 14 2019 11:55:14
%S A285991 1,-2,-30,-100,262,3672,13836,-80,-264810,-1421438,-3019032,7630764,
%T A285991 89648580,358974280,548677872,-2390377936,-20531491146,-74635378020,
%U A285991 -110275527170,425036176572,3669041188152,13597190512480,23995331740700,-45340748171760
%N A285991 Expansion of Product_{n>0} ((1-x^n)/(1+x^n))^(n^4) in powers of x.
%F A285991 a(0) = 1, a(n) = -(2/n)*Sum_{k=1..n} A096960(k)*a(n-k) for n > 0.
%F A285991 G.f.: exp(Sum_{k>=1} (sigma_5(k) - sigma_5(2*k))*x^k/(16*k)). - _Ilya Gutkovskiy_, Apr 14 2019
%Y A285991 Product_{n>0} ((1-x^n)/(1+x^n))^(n^m): A002448 (m=0), A285675 (m=1), A285988 (m=2), A285990 (m=3), this sequence (m=4).
%Y A285991 Cf. A096960, A206624.
%K A285991 sign
%O A285991 0,2
%A A285991 _Seiichi Manyama_, Apr 30 2017