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 A022608 #12 Apr 05 2017 09:49:49
%S A022608 1,-13,78,-299,884,-2314,5681,-13052,28158,-58136,116129,-224692,
%T A022608 422214,-774372,1390948,-2450565,4240561,-7221383,12121980,-20076953,
%U A022608 32836752,-53089309,84922877,-134488770,210979548
%N A022608 Expansion of Product_{m>=1} (1+q^m)^(-13).
%H A022608 Seiichi Manyama, <a href="/A022608/b022608.txt">Table of n, a(n) for n = 0..10000</a>
%F A022608 a(n) ~ (-1)^n * 13^(1/4) * exp(Pi*sqrt(13*n/6)) / (2^(7/4) * 3^(1/4) * n^(3/4)). - _Vaclav Kotesovec_, Aug 27 2015
%F A022608 a(0) = 1, a(n) = -(13/n)*Sum_{k=1..n} A000593(k)*a(n-k) for n > 0. - _Seiichi Manyama_, Apr 05 2017
%t A022608 nmax = 50; CoefficientList[Series[Product[1/(1 + x^k)^13, {k, 1, nmax}], {x, 0, nmax}], x] (* _Vaclav Kotesovec_, Aug 27 2015 *)
%K A022608 sign
%O A022608 0,2
%A A022608 _N. J. A. Sloane_