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 A075140 #3 Mar 30 2012 17:22:26
%S A075140 2,14,84,1428,15708,141372,1130976,41846112,5978016,280966752,
%T A075140 3652567776,69398787744,2151362420064,144141282144288,144141282144288,
%U A075140 1008988975010016,41368547975410656,1199687891286909024
%N A075140 Denominator of the generalized harmonic number H(n,5,2).
%C A075140 The numerators are in A075139. See A075135 for more details.
%t A075140 a=5; b=2; maxN=20; s=0; Denominator[Table[s+=1/(a n + b), {n, 0, maxN-1}]]
%Y A075140 Cf. A075135, A075139.
%K A075140 easy,frac,nonn
%O A075140 1,1
%A A075140 _T. D. Noe_, Sep 04 2002