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 A285247 #14 Apr 21 2017 09:54:44
%S A285247 1,-1,-2,2,-3,-2,13,-5,-9,35,-25,-34,91,-78,-102,240,-192,-233,665,
%T A285247 -441,-553,1636,-1063,-1327,3869,-2565,-3229,8738,-6032,-7446,19568,
%U A285247 -13469,-16499,43083,-29101,-35282,93458,-61544,-74539,198072,-128917,-155580,412116,-267021
%N A285247 Expansion of Product_{k>=1} (1-x^(3*k-1))^(3*k-1) * (1-x^(3*k-2))^(3*k-2).
%H A285247 Seiichi Manyama, <a href="/A285247/b285247.txt">Table of n, a(n) for n = 0..10000</a>
%F A285247 Convolution inverse of A262923.
%o A285247 (PARI) x='x+O('x^100); Vec(prod(k=1, 100, (1 - x^(3*k - 1))^(3*k - 1)*(1 - x^(3*k - 2))^(3*k - 2))) \\ _Indranil Ghosh_, Apr 15 2017
%Y A285247 Cf. A262923, A285050, A285212.
%K A285247 sign
%O A285247 0,3
%A A285247 _Seiichi Manyama_, Apr 15 2017