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A086985 A000407(n)-A086984(n). 1
0, 0, 0, 144, 6000, 198000, 6420960, 218453760, 7988440320, 316674489600, 13630070361600, 635880851020800, 32050874586931200, 1738651147833600000, 101100246720625152000, 6277170099060596736000, 414620927349422137344000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..17.

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!) for (i=2, 20, print1(a(i)", "))

CROSSREFS

Cf. A000407, A086984.

Sequence in context: A262788 A319294 A233645 * A259318 A231744 A262783

Adjacent sequences:  A086982 A086983 A086984 * A086986 A086987 A086988

KEYWORD

nonn

AUTHOR

Jon Perry, Jul 27 2003

STATUS

approved

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Last modified April 17 16:59 EDT 2021. Contains 343063 sequences. (Running on oeis4.)