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 A168555 a(n) = n^6*(n^3 + 1)/2. 5
 0, 1, 288, 10206, 133120, 984375, 5062176, 20235628, 67239936, 193975965, 500500000, 1179859626, 2581383168, 5304663091, 10334288160, 19227375000, 34368126976, 59306007033, 99196651296, 161367371830, 256032000000, 397182906351, 603691298848, 900650348676 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS a(n) is the number of inequivalent 3 X 3 matrices with entries in {1,2,...,n} when a matrix and its transpose are considered equivalent. - Geoffrey Critzer, Dec 18 2011. LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..10000 Index entries for linear recurrences with constant coefficients, signature (10,-45,120,-210,252,-210,120,-45,10,-1). FORMULA G.f.: x*(1 + 278*x + 7371*x^2 + 43900*x^3 + 78095*x^4 + 44334*x^5 + 7237*x^6 + 224*x^7) / (1 - x)^10. - Colin Barker, Feb 23 2017 MATHEMATICA Table[n^6*(n^3 + 1)/2, {n, 0, 25}] (* G. C. Greubel, Jul 26 2016 *) PROG (MAGMA) [n^6*(n^3+1)/2: n in [0..30]]; // Vincenzo Librandi, Aug 29 2011 (PARI) a(n) = (n^6+n^9)/2 \\ Charles R Greathouse IV, Dec 20 2011 (PARI) concat(0, Vec(x*(1 + 278*x + 7371*x^2 + 43900*x^3 + 78095*x^4 + 44334*x^5 + 7237*x^6 + 224*x^7) / (1 - x)^10 + O(x^30))) \\ Colin Barker, Feb 23 2017 CROSSREFS Sequence in context: A264204 A202165 A264001 * A163731 A223293 A035749 Adjacent sequences:  A168552 A168553 A168554 * A168556 A168557 A168558 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Dec 11 2009 STATUS approved

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Last modified September 16 05:49 EDT 2021. Contains 347469 sequences. (Running on oeis4.)