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A130426 a(n) = denominator of Sum_{k=1..n} 1/k^(n+1-k). 1
1, 2, 12, 72, 1080, 129600, 54432000, 22861440000, 9601804800000, 4032758016000000, 18631342033920000000, 86076800196710400000000, 5169772619814426624000000000, 310496543546054463037440000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

MATHEMATICA

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

CROSSREFS

Cf. A130425, A003101.

Sequence in context: A005443 A002867 A235359 * A002397 A163085 A328946

Adjacent sequences:  A130423 A130424 A130425 * A130427 A130428 A130429

KEYWORD

frac,nonn

AUTHOR

Leroy Quet, May 26 2007

EXTENSIONS

More terms from Stefan Steinerberger, May 30 2007

STATUS

approved

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Last modified October 24 18:08 EDT 2021. Contains 348233 sequences. (Running on oeis4.)