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 A269339 #6 Feb 24 2016 11:01:54
%S A269339 1,-2,-1,0,2,6,-3,12,-13,-2,-15,2,-65,44,37,-90,134,26,334,-270,66,18,
%T A269339 774,-1280,-15,-2266,2627,-352,-3575,-516,-484,5660,-3629,21408,
%U A269339 -20639,-1228,15595,31796,-22214,55390,-104447,58958,-160254,180704,17402,-103200
%N A269339 Expansion of Product_{k>=1} (1 - k*x^k) / (1 + x^k).
%H A269339 Vaclav Kotesovec, <a href="/A269339/b269339.txt">Table of n, a(n) for n = 0..5000</a>
%t A269339 nmax=50; CoefficientList[Series[Product[(1-k*x^k)/(1+x^k), {k, 1, nmax}], {x, 0, nmax}], x]
%Y A269339 Cf. A022661, A081362, A267004, A267005, A268500.
%K A269339 sign
%O A269339 0,2
%A A269339 _Vaclav Kotesovec_, Feb 24 2016