OFFSET
0,2
FORMULA
Number triangle T(n,k)=sum{j=0..n-k, C(j-k,j)C(n-k,j)}
EXAMPLE
Triangle begins
1,
2, 1,
4, 1, 1,
8, 1, 0, 1,
16, 1, -1, -1, 1,
32, 1, -2, -2, -2, 1,
64, 1, -3, -2, -2, -3, 1
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, Mar 09 2006
STATUS
approved