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A101628 Denominator of partial sums of a certain series. 1
1, 35, 210, 30030, 12012, 1293292, 6466460, 743642900, 6692786100, 6016814703900, 12033629407800, 63606326869800, 63606326869800, 784965679900201800, 784965679900201800, 258253708687166392200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The numerators are given in A101627.

LINKS

Table of n, a(n) for n=1..16.

FORMULA

a(n)=denominator(s(n)) with s(n)=8*sum(1/((3*k-1)*k*(3*k+1)), k=1..n).

MATHEMATICA

Denominator[Accumulate[Table[8/(9k^3-k), {k, 20}]]] (* Harvey P. Dale, Jul 17 2014 *)

CROSSREFS

Sequence in context: A219942 A232713 A007329 * A064013 A240137 A020262

Adjacent sequences:  A101625 A101626 A101627 * A101629 A101630 A101631

KEYWORD

nonn,frac,easy

AUTHOR

Wolfdieter Lang, Dec 23 2004

STATUS

approved

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Last modified October 18 00:09 EDT 2019. Contains 328135 sequences. (Running on oeis4.)