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A026040
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a(n) = dot_product(1,2,...,n)*(4,5,...,n,1,2,3).
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4
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24, 40, 64, 98, 144, 204, 280, 374, 488, 624, 784, 970, 1184, 1428, 1704, 2014, 2360, 2744, 3168, 3634, 4144, 4700, 5304, 5958, 6664, 7424, 8240, 9114, 10048, 11044, 12104, 13230, 14424, 15688, 17024, 18434, 19920, 21484, 23128, 24854, 26664
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OFFSET
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4,1
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LINKS
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FORMULA
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G.f.: x^4*(24 - 56*x + 48*x^2 - 14*x^3)/(1 - x)^4. - Colin Barker, Sep 17 2012
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MAPLE
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a:=n->n*(n^2-3*n+14)/3: seq(a(n), n=4..50); # Emeric Deutsch, Nov 27 2006
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MATHEMATICA
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Table[Range[n].RotateLeft[Range[n], 3], {n, 4, 52}] (* T. D. Noe, Nov 07 2006 *)
CoefficientList[Series[(24 - 56 x + 48 x^2 - 14 x^3)/(1 - x)^4, {x, 0, 50}], x] (* Vincenzo Librandi, Oct 17 2013 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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