OFFSET
0,3
COMMENTS
Hankel transform is A188477(n+1).
FORMULA
a(n)=sum{k=0..floor(n/2), sum{j=0..n-2k+1, (j/(n-k+2-j))*C(n-k+2-j,n-k+1)*C(n-k+2-j,k+1)*2^(j-1)}}.
Conjecture: (n+3)*a(n) +(-4*n-9)*a(n-1) +n*a(n-2) -3*a(n-3) +3*(5*n+1)*a
(n-4) +6*(n)*a(n-5) +6*(n-1)*a(n-6) +4*(-n+3)*a(n-7)=0. - R. J. Mathar, Dec 03 2014
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Paul Barry, Apr 01 2011
STATUS
approved