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 A029840 #13 Aug 11 2018 11:35:51
%S A029840 1,3,0,-5,3,9,-7,-15,9,27,-12,-45,22,66,-36,-99,51,153,-73,-222,108,
%T A029840 311,-159,-441,221,624,-297,-863,414,1170,-575,-1584,765,2144,-1014,
%U A029840 -2862,1361,3774,-1809,-4964,2361,6516,-3063,-8481
%N A029840 Expansion of Product_{m>=1} ((1+q^(2*m-1))/(1+q^(2*m)))^3.
%H A029840 Seiichi Manyama, <a href="/A029840/b029840.txt">Table of n, a(n) for n = 0..10000</a>
%F A029840 G.f.: x^(3/8)*theta_2(sqrt(x))^3/theta_2(x)^3, where theta_() is the Jacobi theta function. - _Ilya Gutkovskiy_, Dec 04 2017
%Y A029840 Cf. A029838, A029839, A029841, A029842, A029843, A029844.
%K A029840 sign
%O A029840 0,2
%A A029840 _N. J. A. Sloane_