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 A306707 #5 Mar 05 2019 18:18:34
%S A306707 1,1,-1,1,0,0,-2,2,2,-1,-7,5,8,-4,-22,23,30,-32,-101,102,160,-81,-434,
%T A306707 288,515,-249,-1393,1542,1756,-1950,-6694,7040,10192,-4724,-29594,
%U A306707 18851,30282,-9298,-89627,106068,97255,-127909,-453650,498939,641627,-207845,-2026461
%N A306707 Expansion of Sum_{k>=0} x^(k^2) / Product_{j=1..k} (1 + j*x^j).
%t A306707 nmax = 46; CoefficientList[Series[Sum[x^(k^2)/Product[(1 + j x^j), {j, 1, k}], {k, 0, nmax}], {x, 0, nmax}], x]
%Y A306707 Cf. A053256, A318770.
%K A306707 sign
%O A306707 0,7
%A A306707 _Ilya Gutkovskiy_, Mar 05 2019