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 A217672 #6 Oct 16 2012 16:27:08
%S A217672 1,8,16,36,24,32,60,72,80,48,135,200,168,120,297,189,144,96,160,252,
%T A217672 180,270,539,400,405,315,336,240,594,378,192,660,525,420,288,448,600,
%U A217672 770,320,648,504,1001,675,360,560,1496,1125,972,800,810,630,1056,1300,384
%N A217672 Largest k such that k^n divides k!!
%C A217672 Largest k such that A217467(k)=n.
%e A217672 a(5)=24 because 24^5 divides 24!! but 24^6 does not divide 24!!.
%t A217672 kdn[n_]:=Module[{k=2}, While[!Divisible[k!!, k^n]||Divisible[k!!, k^(n+1)], k++]; k]; Join[{1}, Array[kdn, 60, 2]]
%Y A217672 Cf. A006882, A133481, A217467.
%K A217672 nonn
%O A217672 1,2
%A A217672 _Michel Lagneau_, Oct 10 2012