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A145616

Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=4.

1, 3, 5, 70, 315, 3465, 45045, 36036, 51051, 4849845, 1616615, 223092870, 557732175, 5019589575, 145568097675, 36100888223400, 410237366175, 410237366175, 15178782548475, 30357565096950, 622330084487475

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OFFSET

1,2

COMMENTS

For numerators see A145615. For general properties of A_l(x) see A145609.

LINKS

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

MATHEMATICA

m = 4; 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: A261071 A247862 A348205 * A306255 A122912 A062214

Adjacent sequences: A145613 A145614 A145615 * A145617 A145618 A145619

KEYWORD

frac,nonn

AUTHOR

Artur Jasinski, Oct 14 2008

EXTENSIONS

Edited by R. J. Mathar, Aug 21 2009

STATUS

approved