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 A134184 #2 Mar 30 2012 18:59:20
%S A134184 1,1,3,7,17,43,109,279,721,1871,4881,12783,33585,88495,233745,618719,
%T A134184 1640833,4358719,11595841,30890751,82391297,219995007,588004737,
%U A134184 1573072383,4211960065,11286490879,30265474305
%N A134184 A transform of the central binomial coefficients A001405.
%C A134184 Hankel transform is A134185.
%F A134184 G.f.: g(x(1+x)) where g(x) is the g.f. of A001405; a(n)=sum{k=0..n, binomial(k,n-k)*binomial(k,floor(k/2))}; a(n)=sum{k=0..floor(n/2), binomial(n-k,k)*binomial(n-k,floor((n-k)/2))};
%K A134184 easy,nonn
%O A134184 0,3
%A A134184 _Paul Barry_, Oct 11 2007