%I
%S 1,81,50625,121550625,9845600625,144149438750625,4117052120156600625,
%T 4117052120156600625,343860310127599440800625,
%U 44812219476138886724578250625,44812219476138886724578250625
%N Denominators of partial sums for a series for (Pi^4)/96.
%C Numerators are given in A120269.
%C See the comments and the W. Lang link under A120269.
%F a(n)=denominator(r(n)) with r(n):=sum(1/(2*k1)^4,k=1..n).
%t a[n_] := (Pi^4  PolyGamma[3, n + 1/2])/96 // Simplify // Denominator; Table[a[n], {n, 1, 11}] (* _JeanFrançois Alcover_, Dec 05 2013 *)
%K nonn,frac,easy
%O 1,2
%A _Wolfdieter Lang_ Apr 04 2007
