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 A061048 #8 Jul 07 2017 03:37:52
%S A061048 1,3136,3969,4900,5929,7056,8281,196,11025,12544,14161,15876,17689,
%T A061048 19600,441,23716,25921,28224,30625,33124,35721,784,41209,44100,47089,
%U A061048 50176,53361,56644,1225,63504,67081,70756,74529,78400,82369
%N A061048 Denominator of 1/49 - 1/n^2.
%H A061048 G. C. Greubel, <a href="/A061048/b061048.txt">Table of n, a(n) for n = 7..1000</a>
%t A061048 Table[Denominator[1/7^2 - 1/n^2], {n, 7, 50}] (* _G. C. Greubel_, Jul 07 2017 *)
%o A061048 (PARI) for(n=7,50, print1(denominator(1/7^2 - 1/n^2), ", ")) \\ _G. C. Greubel_, Jul 07 2017
%Y A061048 Cf. A061035-A061050.
%Y A061048 Cf. A061047 (numerator).
%K A061048 nonn,frac
%O A061048 7,2
%A A061048 _N. J. A. Sloane_, May 26 2001