A145630 Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=11.

2, 12, 60, 840, 2520, 2520, 32760, 65520, 1113840, 4232592, 4232592, 97349616, 2433740400, 7301221200, 211735414800, 13127595717600, 13127595717600, 13127595717600, 485721041551200, 485721041551200, 19914562703599200

Offset

1,1

Comments

For numerators see A145628. For general properties of A_l(x) see A145609.

Links

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

Mathematica

m = 11; 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: A362238 A372986 A190425 * A082688 A099996 A352881

Adjacent sequences: A145627 A145628 A145629 * A145631 A145632 A145633

Keyword

frac,nonn

Author

Artur Jasinski, Oct 14 2008

Extensions

Edited by R. J. Mathar, Aug 21 2009

Status

approved