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 A306703 #5 Mar 05 2019 18:18:13
%S A306703 1,1,0,1,-2,1,-2,1,-4,7,-5,7,-7,16,-13,16,-33,38,-39,31,-75,79,-92,
%T A306703 118,-139,201,-230,269,-264,494,-476,523,-780,886,-1095,1261,-1533,
%U A306703 1857,-2593,2197,-3367,4256,-4240,5816,-6484,7985,-9800,11051,-12561,17530,-17516
%N A306703 Expansion of Sum_{k>=0} x^k / Product_{j=1..k} (1 + x^j)^j.
%t A306703 nmax = 50; CoefficientList[Series[Sum[x^k/Product[(1 + x^j)^j, {j, 1, k}], {k, 0, nmax}], {x, 0, nmax}], x]
%Y A306703 Cf. A081362, A206100.
%K A306703 sign
%O A306703 0,5
%A A306703 _Ilya Gutkovskiy_, Mar 05 2019