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 A327720 #17 Sep 23 2019 09:22:48
%S A327720 1,1,1,1,2,3,3,3,4,6,7,9,10,12,14,17,21,23,26,32,40,46,51,57,68,80,91,
%T A327720 102,115,135,156,180,197,219,250,290,333,364,403,456,526,594,648,708,
%U A327720 803,922,1037,1128,1223,1373,1560,1752,1902,2062,2300,2613,2926,3149,3378,3740
%N A327720 Expansion of Product_{k>=1} (1 + x^k/(1 + x^(2*k)/(1 + x^(3*k)/(1 + x^(4*k)/(1 + x^(5*k)))))).
%C A327720 a(169) = -3504817 < 0.
%H A327720 Seiichi Manyama, <a href="/A327720/b327720.txt">Table of n, a(n) for n = 0..1000</a>
%t A327720 nmax = 60; CoefficientList[Series[Product[(1 + x^k/(1 + x^(2*k)/(1 + x^(3*k)/(1 + x^(4*k)/(1 + x^(5*k)))))), {k, 1, nmax}], {x, 0, nmax}], x] (* _Vaclav Kotesovec_, Sep 23 2019 *)
%o A327720 (PARI) N=66; x='x+O('x^N); Vec(prod(k=1, N, 1+x^k/(1+x^(2*k)/(1+x^(3*k)/(1+x^(4*k)/(1+x^(5*k)))))))
%Y A327720 Cf. A327716, A327717, A327718, A327719.
%K A327720 sign,look
%O A327720 0,5
%A A327720 _Seiichi Manyama_, Sep 23 2019