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A107866
Column 0 of triangle A107865.
1
1, -1, -1, -7, -77, -1145, -21410, -481683, -12655196, -379998938, -12830421321, -480984691304, -19816691903510, -889846823832596, -43247136243424267, -2261480610502143020, -126596066994553497948, -7553154370244179931495, -478456478496821309024061
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
Sequence in context: A234466 A306031 A249933 * A034176 A001765 A246460
KEYWORD
sign
AUTHOR
Paul D. Hanna, Jun 04 2005
STATUS
approved