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 A082760 #6 Mar 31 2012 14:41:37
%S A082760 1,9,133,2283,41589,782149,15007831,291987327,5738781717,113670432141,
%T A082760 2265365597553,45371770152927,912463490703879,18413786266130979,
%U A082760 372689501160357787,7562267679664012693,153785739808245476757
%N A082760 Trinomial transform of central binomial coefficients (A000984).
%F A082760 a(n) = Sum[ Binomial[2k, k] Trinomial[n, k], {k, 0, 2n} ] where Trinomial[n, k] = trinomial coefficients (A027907)
%F A082760 a(n)=sum{k=0..n, sum{j=0..n, C(n, j)C(j, k)C(2(j+k), j+k)}}; - _Paul Barry_, Feb 15 2005
%K A082760 easy,nonn
%O A082760 0,2
%A A082760 _Emanuele Munarini_, May 21 2003