A145636 Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=15.

2, 4, 4, 56, 56, 616, 8008, 16016, 816816, 5173168, 5173168, 118982864, 118982864, 356948592, 3450503056, 213931189472, 19448289952, 58344869856, 719586728224, 719586728224, 4214722265312, 1993563631492576, 1993563631492576

Offset

1,1

Comments

For numerators see A145637. For general properties of A_l(x) see A145609.

Links

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

Mathematica

m = 15; 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: A290606 A155952 A277445 * A334190 A280795 A059052

Adjacent sequences: A145633 A145634 A145635 * A145637 A145638 A145639

Keyword

frac,nonn

Author

Artur Jasinski, Oct 14 2008

Extensions

Edited by R. J. Mathar, Aug 21 2009

Status

approved