OFFSET
0,2
FORMULA
Number triangle T(n,k)=(-1)^(n-k)(C(k,n-k)+4*C(k, n-k-1))
EXAMPLE
Triangle begins
1,
-4, 1,
0, -5, 1,
0, 4, -6, 1,
0, 0, 9, -7, 1,
0, 0, -4, 15, -8, 1,
0, 0, 0, -13, 22, -9, 1,
0, 0, 0, 4, -28, 30, -10, 1
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, Mar 10 2006
STATUS
approved