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 A052209 #4 Mar 03 2014 18:51:42 %S A052209 4,224,11700,608384,31625044,1643896800,85451019364,4441809150464, %T A052209 230888624955300,12001766689086944,623860979209662484, %U A052209 32428769152221187200,1685672134936321275124,87622522247536594107104 %N A052209 b(n)*b(2*n), b(n) = A001353(n+1). %F A052209 G.f.: (-4x^2+4)/[(1-4x+x^2)(1-52x+x^2)]. %K A052209 nonn %O A052209 0,1 %A A052209 _Gary W. Adamson_, Feb 01 2000