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A086985
a(n) = A000407(n) - A086984(n).
1
0, 0, 0, 144, 6000, 198000, 6420960, 218453760, 7988440320, 316674489600, 13630070361600, 635880851020800, 32050874586931200, 1738651147833600000, 101100246720625152000, 6277170099060596736000, 414620927349422137344000
OFFSET
1,4
FORMULA
a(n) = (2*n-1)!/(n-1)! - n! - Sum_{i=2..n} binomial(n-1, n-i)*n*n!.
PROG
(PARI) a(n)=(2*n-1)!/(n-1)!-n!-sum(i=2, n, binomial(n-1, n-i)*n*n!)
CROSSREFS
Sequence in context: A262788 A319294 A233645 * A371251 A259318 A231744
KEYWORD
nonn
AUTHOR
Jon Perry, Jul 27 2003
STATUS
approved