login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A130425 a(n) = numerator of Sum_{k=1..n} 1/k^(n+1-k). 1
1, 3, 19, 107, 1471, 164059, 65442581, 26560388929, 10901416818161, 4504891039128649, 20562691778919031051, 94108143760454361244249, 5609165278757040127506253363, 334755533004517896353486403105731 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..14.

MATHEMATICA

Table[Numerator[Sum[1/k^(n + 1 - k), {k, 1, n}]], {n, 1, 20}] (* Stefan Steinerberger, May 30 2007 *)

CROSSREFS

Cf. A130426, A003101.

Sequence in context: A323290 A072950 A240123 * A334976 A103005 A162354

Adjacent sequences:  A130422 A130423 A130424 * A130426 A130427 A130428

KEYWORD

frac,nonn

AUTHOR

Leroy Quet, May 26 2007

EXTENSIONS

More terms from Stefan Steinerberger, May 30 2007

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 25 12:38 EDT 2021. Contains 347654 sequences. (Running on oeis4.)