%I #11 Apr 21 2017 09:54:48
%S 1,-1,-2,-1,0,9,-1,-3,-2,-2,36,-22,-40,-34,-23,154,-53,-89,-48,-4,652,
%T -161,-352,-293,-213,1974,-813,-1416,-1198,-838,6386,-2328,-3970,
%U -3054,-1682,20641,-5637,-10436,-8183,-4723,59693,-17856,-32830,-28002,-19303
%N Expansion of Product_{k>=1} (1 - x^k)^k/(1 - x^(5*k))^(5*k).
%H Seiichi Manyama, <a href="/A285285/b285285.txt">Table of n, a(n) for n = 0..10000</a>
%t nmax = 50; CoefficientList[Series[Product[(1 - x^k)^k/(1 - x^(5*k))^(5*k), {k,1,nmax}], {x,0,nmax}], x] (* _Vaclav Kotesovec_, Apr 16 2017 *)
%Y Product_{k>=1} (1 - x^k)^k/(1 - x^(m*k))^(m*k): A285069 (m=2), A285247 (m=3), A285284 (m=4), this sequence (m=5).
%K sign
%O 0,3
%A _Seiichi Manyama_, Apr 16 2017