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 A264685 #7 Nov 21 2015 06:19:05
%S A264685 1,3,9,24,60,141,324,717,1560,3330,7020,14622,30225,61998,126522,
%T A264685 257007,520326,1050396,2116116,4255584,8547330,17149350,34382295,
%U A264685 68889840,137969466,276220962,552865365,1106356314,2213644548,4428657402,8859340926,17721640698
%N A264685 Expansion of Product_{k>=1} (1 + x^k)/(1 - 2*x^k).
%H A264685 Vaclav Kotesovec, <a href="/A264685/b264685.txt">Table of n, a(n) for n = 0..1000</a>
%F A264685 a(n) ~ c * 2^n, where c = A079555 / A048651 = Product_{k>=1} (2^k+1)/(2^k-1) = 8.25598793577825006554414084943227312652...
%t A264685 nmax = 40; CoefficientList[Series[Product[(1 + x^k)/(1 - 2*x^k), {k, 1, nmax}], {x, 0, nmax}], x]
%Y A264685 Cf. A000009, A006951, A070933, A261584, A264686.
%K A264685 nonn
%O A264685 0,2
%A A264685 _Vaclav Kotesovec_, Nov 21 2015