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%I #2 Mar 30 2012 17:30:49
%S 3,15,117,627,8571,35649,699171,7898361,40404717,41219817,1300637127,
%T 22464584559,843217244283,854342788713,7181761691859,864748487122557,
%U 6116114629522299,6175362432667599,6231378537459519,182250420468103851
%N Numerator of 3 * H(n,3,1), a generalized harmonic number. See A075135.
%t Table[ Numerator[ Sum[1/i, {i, 1/3, n}]], {n, 1, 20}]
%Y The denominators are in A051536.
%Y Cf. A075135.
%K easy,frac,nonn
%O 1,1
%A _Robert G. Wilson v_, Aug 27 2002