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A047927
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a(n) = n*(n-1)*(n-2)^2.
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7
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0, 6, 48, 180, 480, 1050, 2016, 3528, 5760, 8910, 13200, 18876, 26208, 35490, 47040, 61200, 78336, 98838, 123120, 151620, 184800, 223146, 267168, 317400, 374400, 438750, 511056, 591948, 682080, 782130, 892800, 1014816, 1148928
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OFFSET
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2,2
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COMMENTS
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a(n) = A245334(n,3), n > 2. - Reinhard Zumkeller, Aug 31 2014
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 2..1000
Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1)
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FORMULA
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From R. J. Mathar, May 01 2014: (Start)
G.f.: -6*x^3*(1+3*x) / (x-1)^5.
a(n) = 6*A002417(n-2). (End)
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PROG
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(MAGMA) [n*(n-1)*(n-2)^2: n in [2..40]]; // Vincenzo Librandi, May 02 2011
(Haskell)
a047927 n = if n == 2 then 0 else a245334 n 3
-- Reinhard Zumkeller, Aug 31 2014
(PARI) a(n)=n*(n-1)*(n-2)^2 \\ Charles R Greathouse IV, Oct 07 2015
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CROSSREFS
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Cf. A059238, A245334.
Sequence in context: A335384 A331668 A005353 * A059238 A254832 A026695
Adjacent sequences: A047924 A047925 A047926 * A047928 A047929 A047930
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane
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EXTENSIONS
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Offset changed from 0 to 2 by Vincenzo Librandi, May 02 2011
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STATUS
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approved
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