OFFSET
0,2
FORMULA
Number triangle T(n,k)=(-1)^(n-k)(C(k,n-k)+3*C(k, n-k-1))
EXAMPLE
Triangle begins
1,
-3, 1,
0, -4, 1,
0, 3, -5, 1,
0, 0, 7, -6, 1,
0, 0, -3, 12, -7, 1,
0, 0, 0, -10, 18, -8, 1,
0, 0, 0, 3, -22, 25, -9, 1
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, Mar 10 2006
STATUS
approved