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 A145636 #4 Mar 31 2012 10:22:14
%S A145636 2,4,4,56,56,616,8008,16016,816816,5173168,5173168,118982864,
%T A145636 118982864,356948592,3450503056,213931189472,19448289952,58344869856,
%U A145636 719586728224,719586728224,4214722265312,1993563631492576,1993563631492576
%N 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.
%C A145636 For numerators see A145637. For general properties of A_l(x) see A145609.
%t A145636 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*)
%Y A145636 Cf. A145609 - A145640.
%K A145636 frac,nonn
%O A145636 1,1
%A A145636 _Artur Jasinski_, Oct 14 2008
%E A145636 Edited by _R. J. Mathar_, Aug 21 2009