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 A064184 #5 Apr 30 2014 01:38:49
%S A064184 1,1,1,1,2,3,14,69,2338,270825,1546051598,706593182981475,
%T A064184 2673049418728144394217734,3191384003253515767044930785193578829525,
%U A064184 20884425143442468474684561246519089172344375280349724305463253298
%N A064184 Denominator of sequence defined by recursion c(n)=1+c(n-2)/c(n-1), c(0)=0, c(1)=1.
%F A064184 a(n) = (a(n-1) * a(n-4) + a(n-2)^2) * a(n-2) /a(n-4).
%F A064184 a(n) = A066356(n-1) * a(n-2).
%o A064184 (PARI) {a(n) = if( n<4, n>=0, (a(n-1) * a(n-4) + a(n-2)^2) * a(n-2) / a(n-4))}
%Y A064184 Cf. A066356.
%K A064184 nonn,easy
%O A064184 0,5
%A A064184 _Michael Somos_, Dec 21 2001