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A074597 Numerator of 3 * H(n,3,2), a generalized harmonic number. See A075135. 2
3, 21, 99, 1209, 9123, 164331, 34437, 823467, 11066355, 330317679, 1355321733, 990324351, 19205317149, 802205873349, 815985479709, 38957620226163, 197637723726063, 10617280487243739, 75264900895382073 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..19.

MATHEMATICA

Table[ Numerator[ Sum[1/i, {i, 2/3, n}]], {n, 1, 20}]

CROSSREFS

The denominators are in A051540.

Cf. A075135.

Sequence in context: A069017 A264246 A144883 * A241795 A289399 A306093

Adjacent sequences:  A074594 A074595 A074596 * A074598 A074599 A074600

KEYWORD

easy,frac,nonn

AUTHOR

Robert G. Wilson v, Aug 27 2002

STATUS

approved

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Last modified September 19 23:31 EDT 2019. Contains 327207 sequences. (Running on oeis4.)