A145632 Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=12.

1, 1, 5, 70, 7, 77, 1001, 20020, 255255, 1616615, 1616615, 74364290, 185910725, 79676025, 770201575, 191009990600, 2170568075, 45581929575, 562177131425, 1124354262850, 3292751769775, 1557471587103575, 1557471587103575

Offset

1,3

Comments

For numerators see A145631. For general properties of A_l(x) see A145609.

Links

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

Mathematica

m = 12; 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: A157038 A211393 A231355 * A299318 A051538 A218709

Adjacent sequences: A145629 A145630 A145631 * A145633 A145634 A145635

Keyword

frac,nonn

Author

Artur Jasinski, Oct 14 2008

Extensions

Edited by R. J. Mathar, Aug 21 2009

Status

approved