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 A022621 #12 Feb 15 2018 08:12:20
%S A022621 1,-26,325,-2626,15626,-74256,298831,-1063426,3447132,-10372882,
%T A022621 29340142,-78744042,202029633,-498419898,1187802148,-2744629914,
%U A022621 6168519890,-13520237380,28964225680,-60763817556,125042511217,-252773944748,502601225828,-984061449124,1899179853506
%N A022621 Expansion of Product_{m>=1} (1+q^m)^(-26).
%H A022621 G. C. Greubel, <a href="/A022621/b022621.txt">Table of n, a(n) for n = 0..1000</a>
%F A022621 a(n) ~ (-1)^n * 13^(1/4) * exp(Pi*sqrt(13*n/3)) / (2^(3/2) * 3^(1/4) * n^(3/4)). - _Vaclav Kotesovec_, Aug 27 2015
%t A022621 nmax = 50; CoefficientList[Series[Product[1/(1 + x^k)^26, {k, 1, nmax}], {x, 0, nmax}], x] (* _Vaclav Kotesovec_, Aug 27 2015 *)
%K A022621 sign
%O A022621 0,2
%A A022621 _N. J. A. Sloane_