A145626 Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=9.

2, 4, 20, 280, 280, 3080, 40040, 16016, 272272, 25865840, 25865840, 594914320, 2974571600, 2974571600, 86262576400, 5348279736800, 5348279736800, 5348279736800, 10415071066400, 10415071066400, 427017913722400

Offset: 1

Author

Artur Jasinski, Oct 14 2008

Keywords

• frac
• nonn

Comments

For numerators see A145625. For general properties of A_l(x) see A145609.

Crossrefs

Cf. A145609 - A145640.

Programs

Mathematica

m = 9; 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*)

Extensions

Edited by R. J. Mathar, Aug 21 2009