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 A124102 #11 May 25 2016 11:14:24
%S A124102 1,2,12,100,1050,13104,187572,3009864,53281800,1028167140,21427077100,
%T A124102 478684992240,11394223609132,287518731462200,7658231740945200,
%U A124102 214521099763208400,6299407928974197330,193373975594104580880,6189939300884798312700,206159811915133359036600
%N A124102 a(n) = C(2n,n)*Bell(n).
%H A124102 Alois P. Heinz, <a href="/A124102/b124102.txt">Table of n, a(n) for n = 0..445</a>
%F A124102 a(n) = A056857(2n+1,n+1) = A056860(2n+1,n+1). - _Alois P. Heinz_, May 25 2016
%p A124102 with(combinat): a:=n->binomial(2*n,n)*bell(n): seq(a(n), n=0..20);
%t A124102 Table[Binomial[2n,n]*BellB[n],{n,0,20}] (* _Harvey P. Dale_, Apr 20 2012 *)
%Y A124102 Cf. A000110, A056857, A056860.
%K A124102 nonn
%O A124102 0,2
%A A124102 _Zerinvary Lajos_, Nov 26 2006