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 A261634 #4 Aug 28 2015 03:15:34
%S A261634 1,3,3,1,0,3,9,9,3,3,12,18,12,6,18,37,33,15,22,54,66,42,36,81,114,84,
%T A261634 57,112,189,171,109,156,279,294,201,222,405,486,360,328,564,747,617,
%U A261634 504,783,1123,1017,783,1065,1602,1605
%N A261634 Expansion of Product_{k>=0} (1+x^(4*k+1))^3.
%F A261634 a(n) ~ exp(Pi*sqrt(n)/2) / (2^(5/4) * n^(3/4)).
%t A261634 nmax=50; CoefficientList[Series[Product[(1+x^(4*k+1))^3, {k, 0, nmax}], {x, 0, nmax}], x]
%Y A261634 Cf. A261612, A261615, A261633, A169975, A261630.
%K A261634 nonn
%O A261634 0,2
%A A261634 _Vaclav Kotesovec_, Aug 27 2015