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 A074596 #5 Jan 22 2025 22:29:11
%S A074596 3,15,117,627,8571,35649,699171,7898361,40404717,41219817,1300637127,
%T A074596 22464584559,843217244283,854342788713,37181761691859,864748487122557,
%U A074596 6116114629522299,6175362432667599,6231378537459519,182250420468103851
%N A074596 Numerator of 3 * H(n,3,1), a generalized harmonic number. See A075135.
%t A074596 Table[ Numerator[ Sum[1/i, {i, 1/3, n}]], {n, 1, 20}]
%Y A074596 The denominators are in A051536.
%Y A074596 Cf. A075135.
%K A074596 easy,frac,nonn
%O A074596 1,1
%A A074596 _Robert G. Wilson v_, Aug 27 2002
%E A074596 a(15) corrected by _Sean A. Irvine_, Jan 22 2025