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 A074597 #2 Mar 30 2012 17:30:49
%S A074597 3,21,99,1209,9123,164331,34437,823467,11066355,330317679,1355321733,
%T A074597 990324351,19205317149,802205873349,815985479709,38957620226163,
%U A074597 197637723726063,10617280487243739,75264900895382073
%N A074597 Numerator of 3 * H(n,3,2), a generalized harmonic number. See A075135.
%t A074597 Table[ Numerator[ Sum[1/i, {i, 2/3, n}]], {n, 1, 20}]
%Y A074597 The denominators are in A051540.
%Y A074597 Cf. A075135.
%K A074597 easy,frac,nonn
%O A074597 1,1
%A A074597 _Robert G. Wilson v_, Aug 27 2002