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 A075143 #3 Mar 30 2012 17:22:26
%S A075143 1,13,109,2323,5045,155881,2788829,37828433,431455909,3116633995,
%T A075143 9612440261,581311042303,4755044206841,111596541950239,
%U A075143 4206025171313755,337970519351250133,343326090001007461
%N A075143 Numerator of the generalized harmonic number H(n,5,4).
%C A075143 The denominators are in A075144. See A075135 for more details.
%t A075143 a=5; b=4; maxN=20; s=0; Numerator[Table[s+=1/(a n + b), {n, 0, maxN-1}]]
%Y A075143 Cf. A075135, A075144.
%K A075143 easy,frac,nonn
%O A075143 1,2
%A A075143 _T. D. Noe_, Sep 04 2002