OFFSET
0,2
FORMULA
Triangle T(n,n)=(2n)!/n!,T(n,n-1)=(2n)!/(n-1)!,T(n,k)=0 otherwise.
EXAMPLE
Triangle begins
1,
-2, 2,
0, -24, 12,
0, 0, -360, 120,
0, 0, 0, -6720, 1680,
0, 0, 0, 0, -151200, 30240,
0, 0, 0, 0, 0, -3991680, 665280,
0, 0, 0, 0, 0, 0, -121080960, 17297280,
0, 0, 0, 0, 0, 0, 0, -4151347200, 518918400,
0, 0, 0, 0, 0, 0, 0, 0, -158789030400, 17643225600,
0, 0, 0, 0, 0, 0, 0, 0, 0, -6704425728000, 670442572800
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, May 25 2006
STATUS
approved