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 A261629 #5 Aug 28 2015 03:14:35
%S A261629 1,2,3,4,5,8,11,14,17,22,30,38,46,56,70,88,106,126,153,186,224,264,
%T A261629 312,372,440,516,603,708,830,964,1117,1296,1503,1734,1992,2292,2638,
%U A261629 3024,3453,3942,4504,5134,5831,6616,7511,8518,9631,10872,12274,13848,15592
%N A261629 Expansion of Product_{k>=0} 1/(1-x^(4*k+1))^2.
%F A261629 a(n) ~ exp(Pi*sqrt(n/3)) * Gamma(1/4)^2 / (8 * Pi^(3/2) * sqrt(n)).
%t A261629 nmax=60; CoefficientList[Series[Product[1/(1-x^(4*k+1))^2, {k, 0, nmax}], {x, 0, nmax}], x]
%Y A261629 Cf. A035451, A261632, A261636.
%K A261629 nonn
%O A261629 0,2
%A A261629 _Vaclav Kotesovec_, Aug 27 2015