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 A285286 #13 Apr 24 2017 10:31:30
%S A285286 1,-1,1,-1,-3,3,-3,-4,14,-14,4,24,-44,31,37,-107,126,-4,-208,329,-175,
%T A285286 -319,777,-704,-236,1507,-1945,430,2532,-4575,2781,3236,-9301,8697,
%U A285286 2085,-16902,21804,-5233,-26573,47225,-27047,-34332,92242,-80162,-26926,162426
%N A285286 Expansion of Product_{k>=0} 1/(1 + x^(3*k+1))^(3*k+1).
%H A285286 Seiichi Manyama, <a href="/A285286/b285286.txt">Table of n, a(n) for n = 0..10000</a>
%t A285286 nmax = 50; CoefficientList[Series[Product[1/(1 + x^(3*k-2))^(3*k-2), {k,1,nmax}], {x,0,nmax}], x] (* _Vaclav Kotesovec_, Apr 16 2017 *)
%Y A285286 Product_{k>=0} 1/(1 + x^(m*k+1))^(m*k+1): A284628 (m=2), this sequence (m=3), A285287 (m=4).
%Y A285286 Cf. A262949.
%K A285286 sign
%O A285286 0,5
%A A285286 _Seiichi Manyama_, Apr 16 2017