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.

2, 12, 20, 280, 2520, 27720, 27720, 11088, 62832, 5969040, 1989680, 137287920, 686439600, 882565200, 25594390800, 1586852229600, 1586852229600, 11107965607200, 410994727466400, 410994727466400, 16850783826122400

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: A174478 A331947 A349469 * 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