A074597 - OEIS

%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