OFFSET
0,9
FORMULA
Column k has g.f. (x/(1+x))^k*sum{j=0..k, C(k,2j)*2^j*x^(2j)}
EXAMPLE
Triangle begins
1,
0, 1,
0, -1, 1,
0, 1, -2, 1,
0, -1, 5, -3, 1,
0, 1, -8, 12, -4, 1,
0, -1, 11, -28, 22, -5, 1,
0, 1, -14, 51, -68, 35, -6, 1,
0, -1, 17, -81, 159, -135, 51, -7, 1,
0, 1, -20, 118, -312, 390, -236, 70, -8, 1,
0, -1, 23, -162, 544, -926, 816, -378, 92, -9, 1
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, May 14 2006
STATUS
approved