A145640 Denominator the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=16.

1, 3, 5, 35, 315, 3465, 45045, 45045, 255255, 969969, 29393, 2028117, 50702925, 456326325, 13233463425, 820474732350, 4512611027925, 4512611027925, 166966608033225, 12843585233325, 526586994566325, 22643240766351975

Offset

1,2

Comments

For numerators see A145639. For general properties of A_l(x) see A145609.

Links

Table of n, a(n) for n=1..22.

Mathematica

m = 16; 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: A120828 A077784 A325582 * A222496 A086158 A158878

Adjacent sequences: A145637 A145638 A145639 * A145641 A145642 A145643

Keyword

frac,nonn

Author

Artur Jasinski, Oct 14 2008

Extensions

Edited by R. J. Mathar, Aug 21 2009

Status

approved