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 A095175 #9 Apr 09 2014 10:15:50 %S A095175 1,1,4,9,64,225,256,245,16384,99225,65536,480249,1048576,1002001, %T A095175 4194304,41409225,1073741824,2393453205,4294967296,4102737925, %U A095175 68719476736,940839860961,274877906944,4113258565689,17592186044416,16802526820625,70368744177664 %N A095175 Denominator of b(n) given by b(1) = 1, b(2) = 2; for n >= 3, b(n) = (-1)^n (2n-1) ((n-2)!!)^2/((n-1)!!)^2, where n!! is the double factorial A006882. %C A095175 A095159(2n)/a(2n) -> pi as n -> inf.; A095159(2n+1)/a(2n+1) -> -4/pi as n -> inf. - _Leroy Quet_, Aug 03 2004 %Y A095175 Cf. A006882, A095159. %K A095175 nonn,frac %O A095175 1,3 %A A095175 _N. J. A. Sloane_, based on a suggestion of _Leroy Quet_, Jul 03 2004