A145620 - OEIS

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A145620

Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=6.

1, 2, 5, 140, 35, 770, 5005, 40040, 510510, 646646, 323323, 29745716, 14300825, 12257850, 59246275, 29386152400, 7346538100, 77138650050, 475688341975, 24735793782700, 253541886272675, 21804602219450050, 10902301109725025

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OFFSET

1,2

COMMENTS

For numerators see A145619. For general properties of A_l(x) see A145609.

LINKS

Table of n, a(n) for n=1..23.

MATHEMATICA

m = 6; 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: A088271 A236045 A183128 * A130412 A175525 A069139

Adjacent sequences: A145617 A145618 A145619 * A145621 A145622 A145623

KEYWORD

frac,nonn

AUTHOR

Artur Jasinski, Oct 14 2008

EXTENSIONS

Edited by R. J. Mathar, Aug 21 2009

STATUS

approved