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 A011897 a(n) = floor(n*(n-1)*(n-2)/15). 1
 0, 0, 0, 0, 1, 4, 8, 14, 22, 33, 48, 66, 88, 114, 145, 182, 224, 272, 326, 387, 456, 532, 616, 708, 809, 920, 1040, 1170, 1310, 1461, 1624, 1798, 1984, 2182, 2393, 2618, 2856, 3108, 3374, 3655, 3952, 4264, 4592 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (3,-3,1,0,1,-3,3,-1). [From R. J. Mathar, Apr 15 2010] FORMULA From R. J. Mathar, Apr 15 2010: a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) + a(n-5) - 3*a(n-6) + 3*a(n-7) - a(n-8). G.f.: x^4*(x^3-x^2+x+1) / ( (-1+x)^4*(x^4+x^3+x^2+x+1) ). (End) MATHEMATICA CoefficientList[Series[x^4(x^3-x^2+x+1)/((-1+x)^4(x^4+x^3+x^2+x+1)), {x, 0, 45}], x]  (* Harvey P. Dale, Feb 25 2011 *) PROG (MAGMA) [Floor(n*(n-1)*(n-2)/15): n in [0..50]]; // Vincenzo Librandi, Jul 07 2012 CROSSREFS Sequence in context: A054347 A194149 A003682 * A110895 A049628 A063757 Adjacent sequences:  A011894 A011895 A011896 * A011898 A011899 A011900 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified October 17 08:36 EDT 2019. Contains 328107 sequences. (Running on oeis4.)