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 A025543 #17 Nov 15 2016 14:33:32
%S A025543 1,4,12,24,72,360,360,2520,2520,5040,5040,5040,5040,55440,55440,
%T A025543 277200,3603600,10810800,10810800,10810800,21621600,21621600,
%U A025543 367567200,367567200,367567200,6983776800,6983776800,6983776800,6983776800,6983776800
%N A025543 Least common multiple of the first n composite numbers.
%H A025543 Reinhard Zumkeller, <a href="/A025543/b025543.txt">Table of n, a(n) for n = 0..1000</a>
%H A025543 <a href="/index/Di#divseq">Index to divisibility sequences</a>
%t A025543 Table[Apply[LCM, Take[Select[Range[2, 300], !PrimeQ[#] &], n]], {n, 1, 100}] (* _Clark Kimberling_, Nov 12 2016 *)
%o A025543 (Haskell)
%o A025543 a025543 n = a025543_list !! n
%o A025543 a025543_list = scanl lcm 1 a002808_list
%o A025543 -- _Reinhard Zumkeller_, Nov 10 2013
%Y A025543 Differs from A003418 and A051451
%Y A025543 Cf. A002808, A003418, A051451, A064354.
%Y A025543 Cf. A036691.
%K A025543 nonn
%O A025543 0,2
%A A025543 _Clark Kimberling_