OFFSET
0,4
PROG
(PARI) {a(n)=(matrix(n+1, n+1, r, c, if(r>=c, binomial((r-1)*(r-2)/2-(c-1)*(c-2)/2+r-c, r-c)))^-1)[n+1, 1]}
CROSSREFS
KEYWORD
sign
AUTHOR
Paul D. Hanna, Jun 04 2005
STATUS
approved