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Search: id:A086985
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| 0, 0, 0, 144, 6000, 198000, 6420960, 218453760, 7988440320, 316674489600, 13630070361600, 635880851020800, 32050874586931200, 1738651147833600000, 101100246720625152000, 6277170099060596736000, 414620927349422137344000
(list; graph; listen)
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OFFSET
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1,4
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FORMULA
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a(n)=(2*n-1)!/(n-1)!-n!-sum(i=2, n, binomial(n-1, n-i)*n*n!)
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PROGRAM
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(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)", "))
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CROSSREFS
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Cf. A000407, A086984.
Adjacent sequences: A086982 A086983 A086984 this_sequence A086986 A086987 A086988
Sequence in context: A074316 A128989 A008376 this_sequence A008662 A035821 A055352
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KEYWORD
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nonn
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AUTHOR
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Jon Perry (perry(AT)globalnet.co.uk), Jul 27 2003
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