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 A306702 #5 Mar 05 2019 18:18:06
%S A306702 1,1,0,1,-2,1,-1,1,-7,10,0,4,-31,31,8,53,-163,108,-74,212,-450,732,
%T A306702 -353,467,-3412,3614,-145,5613,-11910,8816,-13354,21558,-44624,77598,
%U A306702 -43860,67721,-255791,261710,-127452,529648,-1118393,997295,-1206756,2184148,-3314638,5934992,-5394856
%N A306702 Expansion of Sum_{k>=0} x^k / Product_{j=1..k} (1 + j*x^j).
%t A306702 nmax = 46; CoefficientList[Series[Sum[x^k/Product[(1 + j x^j), {j, 1, k}], {k, 0, nmax}], {x, 0, nmax}], x]
%Y A306702 Cf. A081362, A193196.
%K A306702 sign
%O A306702 0,5
%A A306702 _Ilya Gutkovskiy_, Mar 05 2019