OFFSET
0,3
COMMENTS
FORMULA
a(n, m)= sum(C(2, 2; j)C(2, 2; n-j), j=0..m) if n>=m>=0 else 0.
EXAMPLE
{1}; {1,2}; {4,5,9}; {28,32,36,64}; ...
CROSSREFS
KEYWORD
AUTHOR
Wolfdieter Lang, Feb 05 2002
STATUS
approved