OFFSET
0,4
COMMENTS
a(n+1) is the Hankel transform of A160565.
MAPLE
A160567 := proc(n)
option remember;
if n < 5 then
op(n, [1, 1, 1, -4]);
else
4*(procname(n-1)*procname(n-3)-procname(n-2)^2)/procname(n-4) ;
end if;
end proc: # R. J. Mathar, Feb 25 2015
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Paul Barry, May 19 2009
STATUS
approved