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 A319243 #9 Sep 16 2018 16:35:52
%S A319243 1,-2,2,-2,0,2,-2,2,0,-4,6,-6,4,2,-6,6,-6,2,4,-6,8,-6,-2,6,-8,8,-2,-4,
%T A319243 8,-10,6,2,-6,6,-2,-6,8,-6,2,6,-8,6,-2,-6,8,-4,-2,10,-14,8,0,-6,16,
%U A319243 -14,4,2,-16,18,-2,-10,24,-30,14,4,-20,34,-26,2,16,-30,26,2,-20
%N A319243 Expansion of Product_{k>0} (1 - x^(k^2))/(1 + x^(k^2)).
%F A319243 Convolution inverse of A103265.
%o A319243 (PARI) N=99; x='x+O('x^N); Vec(prod(k=1, sqrtint(N), (1-x^(k^2))/(1+x^(k^2))))
%Y A319243 Product_{k>0} (1 - x^(k^m))/(1 + x^(k^m)): A002448 (m=1), this sequence (m=2), A319244 (m=3).
%Y A319243 Cf. A103265.
%K A319243 sign
%O A319243 0,2
%A A319243 _Seiichi Manyama_, Sep 15 2018