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A165793
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a(0)=1, a(n)=n*(a(n-1)-2).
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3
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1, -1, -6, -24, -104, -530, -3192, -22358, -178880, -1609938, -16099400, -177093422, -2125121088, -27626574170, -386772038408, -5801580576150, -92825289218432, -1578029916713378, -28404538500840840
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OFFSET
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0,3
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LINKS
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G. C. Greubel, Table of n, a(n) for n = 0..250
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FORMULA
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a(n) = n! - 2*floor(e*n!)+2 , n>0. - Gary Detlefs, Jun 19 2010
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MATHEMATICA
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RecurrenceTable[{a[0]==1, a[n]==n*(a[n-1]-2)}, a[n], {n, 30}] (* Harvey P. Dale, Jul 19 2011 *)
FoldList[#1*#2 - 2 #2 &, 1, Range[25]] (* G. C. Greubel, Apr 08 2016 *)
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CROSSREFS
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Sequence in context: A120583 A089378 A074414 * A122740 A034432 A026962
Adjacent sequences: A165790 A165791 A165792 * A165794 A165795 A165796
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KEYWORD
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sign
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AUTHOR
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Philippe Deléham, Sep 26 2009
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EXTENSIONS
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Corrected by Harvey P. Dale, Jul 19 2011
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STATUS
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approved
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