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 A285988 #15 Apr 14 2019 11:55:02
%S A285988 1,-2,-6,-4,22,72,92,-48,-522,-1294,-1624,300,6948,19032,30192,20432,
%T A285988 -45578,-202788,-437178,-599460,-311112,1038624,4023532,8423280,
%U A285988 11892004,8429270,-12073032,-60747944,-139842736,-223644552,-232762256,-15050944,636838518
%N A285988 Expansion of Product_{n>0} ((1-x^n)/(1+x^n))^(n^2) in powers of x.
%H A285988 Seiichi Manyama, <a href="/A285988/b285988.txt">Table of n, a(n) for n = 0..10000</a>
%F A285988 a(0) = 1, a(n) = -(2/n)*Sum_{k=1..n} A007331(k)*a(n-k) for n > 0.
%F A285988 G.f.: exp(Sum_{k>=1} (sigma_3(k) - sigma_3(2*k))*x^k/(4*k)). - _Ilya Gutkovskiy_, Apr 14 2019
%Y A285988 Product_{n>0} ((1-x^n)/(1+x^n))^(n^m): A002448 (m=0), A285675 (m=1), this sequence (m=2), A285990 (m=3), A285991 (m=4).
%Y A285988 Cf. A007331, A206622.
%K A285988 sign
%O A285988 0,2
%A A285988 _Seiichi Manyama_, Apr 30 2017