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Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=6.
1

%I #4 Mar 31 2012 10:22:14

%S 1,2,5,140,35,770,5005,40040,510510,646646,323323,29745716,14300825,

%T 12257850,59246275,29386152400,7346538100,77138650050,475688341975,

%U 24735793782700,253541886272675,21804602219450050,10902301109725025

%N Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=6.

%C For numerators see A145619. For general properties of A_l(x) see A145609.

%t m = 6; 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*)

%Y Cf. A145609 - A145640.

%K frac,nonn

%O 1,2

%A _Artur Jasinski_, Oct 14 2008

%E Edited by _R. J. Mathar_, Aug 21 2009