OFFSET
0,3
COMMENTS
Hankel transform is A134185.
FORMULA
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))};
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Oct 11 2007
STATUS
approved