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A145616
Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=4.
1
1, 3, 5, 70, 315, 3465, 45045, 36036, 51051, 4849845, 1616615, 223092870, 557732175, 5019589575, 145568097675, 36100888223400, 410237366175, 410237366175, 15178782548475, 30357565096950, 622330084487475
OFFSET
1,2
COMMENTS
For numerators see A145615. For general properties of A_l(x) see A145609.
MATHEMATICA
m = 4; 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
Sequence in context: A261071 A247862 A348205 * A306255 A122912 A062214
KEYWORD
frac,nonn
AUTHOR
Artur Jasinski, Oct 14 2008
EXTENSIONS
Edited by R. J. Mathar, Aug 21 2009
STATUS
approved