OFFSET
1,3
PROG
(PARI) a(n)=polcoeff(charpoly(matrix(n, n, i, j, i!-j!)), n-2)
(PARI) a(n)=sum(i=1, n, sum(j=1, i-1, (i!-j!)^2))
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Nov 29 2002
STATUS
approved