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 A145614 #4 Mar 31 2012 10:22:14
%S A145614 2,4,20,280,280,3080,5720,2288,116688,3695120,25865840,594914320,
%T A145614 2974571600,8923714800,86262576400,5348279736800,5348279736800,
%U A145614 16044839210400,197886350261600,15222026943200,89157586381600
%N A145614 Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=3.
%C A145614 For numerators see A145613. For general properties of A_l(x) see A145609.
%t A145614 m = 3; 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 A145614 Cf. A145609 - A145640.
%K A145614 frac,nonn
%O A145614 1,1
%A A145614 _Artur Jasinski_, Oct 14 2008
%E A145614 Edited by _R. J. Mathar_, Aug 21 2009