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 A334669 #26 Jan 14 2023 10:56:09
%S A334669 1,128,279936,35831808,2799360000000,2799360000000,
%T A334669 2305393332480000000,295090346557440000000,645362587921121280000000,
%U A334669 645362587921121280000000,12576291107821424895098880000000,12576291107821424895098880000000,789143616376081512994335288360960000000
%N A334669 Denominator of Sum_{k=1..n} (-1)^(k+1)/k^7.
%C A334669 Lim_{n -> infinity} A334668(n)/a(n) = A275710 = (63/64)*A013665.
%H A334669 Michael De Vlieger, <a href="/A334669/b334669.txt">Table of n, a(n) for n = 1..336</a>
%e A334669 The first few fractions are 1, 127/128, 277877/279936, 35566069/35831808, 2778634972433/2799360000000, 2778624972433/2799360000000, ... = A334668/A334669.
%t A334669 Denominator @ Accumulate[Table[(-1)^(k + 1)/k^7, {k, 1, 13}]] (* _Amiram Eldar_, May 08 2020 *)
%o A334669 (PARI) a(n) = denominator(sum(k=1, n, (-1)^(k+1)/k^7)); \\ _Michel Marcus_, May 08 2020
%Y A334669 Cf. A013665, A275710, A334668 (numerators).
%K A334669 nonn,frac
%O A334669 1,2
%A A334669 _Petros Hadjicostas_, May 07 2020