This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A145620 #4 Mar 31 2012 10:22:14
%S A145620 1,2,5,140,35,770,5005,40040,510510,646646,323323,29745716,14300825,
%T A145620 12257850,59246275,29386152400,7346538100,77138650050,475688341975,
%U A145620 24735793782700,253541886272675,21804602219450050,10902301109725025
%N A145620 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 A145620 For numerators see A145619. For general properties of A_l(x) see A145609.
%t A145620 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 A145620 Cf. A145609 - A145640.
%K A145620 frac,nonn
%O A145620 1,2
%A A145620 _Artur Jasinski_, Oct 14 2008
%E A145620 Edited by _R. J. Mathar_, Aug 21 2009