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A145634 Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=13. 1
2, 12, 20, 280, 2520, 27720, 27720, 11088, 62832, 5969040, 1989680, 137287920, 686439600, 882565200, 25594390800, 1586852229600, 1586852229600, 11107965607200, 410994727466400, 410994727466400, 16850783826122400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

For numerators see A145633. For general properties of A_l(x) see A145609.

LINKS

Table of n, a(n) for n=1..21.

MATHEMATICA

m = 13; aa = {}; Do[k = 0; Do[k = k + m^(2 r + 1 - d)/d, {d, 1, 2 r}]; AppendTo[aa, Denominator[k]], {r, 1, 30}]; aa (*Artur Jasinski*)

CROSSREFS

Cf. A145609 - A145640.

Sequence in context: A291698 A174478 A331947 * A145610 A185399 A096108

Adjacent sequences:  A145631 A145632 A145633 * A145635 A145636 A145637

KEYWORD

frac,nonn

AUTHOR

Artur Jasinski, Oct 14 2008

EXTENSIONS

Edited by R. J. Mathar, Aug 21 2009

STATUS

approved

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Last modified April 11 05:49 EDT 2021. Contains 342886 sequences. (Running on oeis4.)