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 A156132 #6 Sep 29 2013 04:24:32 %S A156132 1,4,33,404,6597,134644,3297693,94228004,3077100777,113046200164, %T A156132 4614532495353,207201136625204,10149511013598957,538592387976486484, %U A156132 30779388439090380213,1884616483302733144004,123087714448128536653137,8541524061361098605073604 %N A156132 Q_n(4) (see A104035). %F A156132 G.f.: 1/Q(0), where Q(k) = 1 - 4*x*(2*k+1) - 17*x^2*(k+1)^2/Q(k+1); (continued fraction). - _Sergei N. Gladkovskii_, Sep 28 2013 %K A156132 nonn %O A156132 0,2 %A A156132 _N. J. A. Sloane_, Nov 06 2009