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 A303130 #17 Apr 20 2018 09:03:34
%S A303130 1,-3,-9,-288,459,-19278,-1539,-1265301,10734525,-147277926,520204923,
%T A303130 -7511358663,88687160577,-668191863951,5357547144702,-87542760890124,
%U A303130 967961569696722,-5115624735401361,46065749188891275,-430898393089547667,6203508335817169257
%N A303130 Expansion of Product_{n>=1} (1 + (9*x)^n)^(-1/3).
%C A303130 This sequence is obtained from the generalized Euler transform in A266964 by taking f(n) = 1/3, g(n) = -9^n.
%H A303130 Seiichi Manyama, <a href="/A303130/b303130.txt">Table of n, a(n) for n = 0..1000</a>
%F A303130 a(n) ~ (-1)^n * exp(Pi*sqrt(n/18)) * 3^(2*n - 1/2) / (2^(7/4) * n^(3/4)). - _Vaclav Kotesovec_, Apr 20 2018
%t A303130 CoefficientList[Series[(2/QPochhammer[-1, 9*x])^(1/3), {x, 0, 20}], x] (* _Vaclav Kotesovec_, Apr 20 2018 *)
%o A303130 (PARI) N=99; x='x+O('x^N); Vec(prod(k=1, N, (1 + (9*x)^k)^(-1/3))) \\ _Altug Alkan_, Apr 20 2018
%Y A303130 Expansion of Product_{n>=1} (1 + ((b^2)*x)^n)^(-1/b): A081362 (b=1), A298993 (b=2), this sequence (b=3), A303131 (b=4), A303132 (b=5).
%Y A303130 Cf. A303074.
%K A303130 sign
%O A303130 0,2
%A A303130 _Seiichi Manyama_, Apr 19 2018