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