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 A321057 #21 Oct 28 2018 10:47:04
%S A321057 1,2,12,94,1522,48154,3087600,377880794,93356591804,46415548879976,
%T A321057 44773963087975388,86770399797767582434,340765670578000502365102,
%U A321057 2625605734866823121935402410,40755373130582885082115865730892,1290109927277547765958474680645604818
%N A321057 a(n) = [x^n] Product_{k>=1} ((1 + x^k)/(1 - x^k))^sigma_n(k).
%H A321057 Seiichi Manyama, <a href="/A321057/b321057.txt">Table of n, a(n) for n = 0..80</a>
%t A321057 Table[SeriesCoefficient[Product[((1 + x^k)/(1 - x^k))^DivisorSigma[n, k], {k, 1, n}], {x, 0, n}], {n, 0, 15}] (* _Vaclav Kotesovec_, Oct 27 2018 *)
%o A321057 (PARI) {a(n) = polcoeff(prod(k=1, n, ((1+x^k+x*O(x^n))/(1-x^k+x*O(x^n)))^sigma(k, n)), n)}
%Y A321057 Cf. A301554, A301555, A301556, A319647, A321042, A321068.
%K A321057 nonn
%O A321057 0,2
%A A321057 _Seiichi Manyama_, Oct 26 2018