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%I #5 Aug 14 2015 23:30:23
%S 20,1260,225225,137837700,49104680625,3277766894527125,
%T 61902833536293750,396627372338514817500,7794458831536571762427234375,
%U 2289686345687357378035370971875,146008313505589229344287856968750
%N Denominator of Sum_{k in A026424} 1/k^(2n).
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PrimeSums.html">Prime Sums</a>
%F Denominator of (zeta(2n)^2-zeta(4n))/(2zeta(2n)).
%e Pi^2/20, Pi^4/1260, (4*Pi^6)/225225, (59*Pi^8)/137837700, ...
%Y Cf. A026424, A093597.
%K nonn,frac
%O 1,1
%A _Eric W. Weisstein_, Apr 03 2004
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