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 A051575 #16 Aug 23 2016 12:39:12
%S A051575 1,1,2,10,70,210,4620,60060,60060,1021020,19399380,19399380,446185740,
%T A051575 2230928700,13385572200,388181593800,12033629407800,12033629407800,
%U A051575 12033629407800,445244288088600,445244288088600,18255015811632600
%N A051575 a(n) = LCM { Catalan(0), ..., Catalan(n) }.
%H A051575 G. C. Greubel, <a href="/A051575/b051575.txt">Table of n, a(n) for n = 0..400</a>
%t A051575 LCM@@@CatalanNumber@Range[0, Range[0, 20]] (* _Vladimir Reshetnikov_, Nov 17 2015 *)
%o A051575 (PARI) a(n) = if(n>1, lcm(a(n-1), binomial(2*n, n)/(n+1)), 1) \\ _David A. Corneth_, Aug 23 2016
%Y A051575 Cf. A000108, A003046, A078491.
%K A051575 nonn
%O A051575 0,3
%A A051575 _N. J. A. Sloane_