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 A022721 #9 Jul 20 2018 03:47:57
%S A022721 1,-29,377,-2900,14877,-56666,189109,-649339,2219834,-6777677,
%T A022721 19041980,-54885893,159810358,-432662339,1117635553,-2957018205,
%U A022721 7799355410,-19555103564,48073453671,-119774561120,294567447945
%N A022721 Expansion of Product_{m>=1} (1+m*q^m)^-29.
%H A022721 G. C. Greubel, <a href="/A022721/b022721.txt">Table of n, a(n) for n = 0..1000</a>
%t A022721 With[{nmax = 50}, CoefficientList[Series[Product[(1 + k*q^k)^-29, {k, 1, nmax}], {q, 0, nmax}], q]] (* _G. C. Greubel_, Jul 20 2018 *)
%o A022721 (PARI) m=50; q='q+O('q^m); Vec(prod(n=1,m,(1+n*q^n)^-29)) \\ _G. C. Greubel_, Jul 20 2018
%K A022721 sign
%O A022721 0,2
%A A022721 _N. J. A. Sloane_