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 A093598 #6 Feb 16 2025 08:32:53
%S A093598 20,1260,225225,137837700,49104680625,3277766894527125,
%T A093598 61902833536293750,396627372338514817500,7794458831536571762427234375,
%U A093598 2289686345687357378035370971875,146008313505589229344287856968750
%N A093598 Denominator of Sum_{k in A026424} 1/k^(2n).
%H A093598 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PrimeSums.html">Prime Sums</a>
%F A093598 Denominator of (zeta(2n)^2-zeta(4n))/(2zeta(2n)).
%e A093598 Pi^2/20, Pi^4/1260, (4*Pi^6)/225225, (59*Pi^8)/137837700, ...
%Y A093598 Cf. A026424, A093597.
%K A093598 nonn,frac
%O A093598 1,1
%A A093598 _Eric W. Weisstein_, Apr 03 2004