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 A261630 #4 Aug 28 2015 03:14:49
%S A261630 1,2,1,0,0,2,4,2,0,2,5,4,1,2,8,10,4,2,9,14,9,4,12,22,16,6,13,30,30,14,
%T A261630 17,40,44,24,21,50,66,42,29,64,92,66,41,78,127,106,62,96,164,152,93,
%U A261630 120,215,220,139,150,269,302,205,192,340,412,296,248,417
%N A261630 Expansion of Product_{k>=0} (1+x^(4*k+1))^2.
%F A261630 a(n) ~ exp(Pi*sqrt(n/6)) / (2 * 6^(1/4) * n^(3/4)).
%t A261630 nmax=80; CoefficientList[Series[Product[(1+x^(4*k+1))^2, {k, 0, nmax}], {x, 0, nmax}], x]
%Y A261630 Cf. A169975, A261634, A261638.
%K A261630 nonn
%O A261630 0,2
%A A261630 _Vaclav Kotesovec_, Aug 27 2015