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 A004255 n(n+1)(n^2 -3n + 6)/8. (Formerly M2794) 4
 1, 3, 9, 25, 60, 126, 238, 414, 675, 1045, 1551, 2223, 3094, 4200, 5580, 7276, 9333, 11799, 14725, 18165, 22176, 26818, 32154, 38250, 45175, 53001, 61803, 71659, 82650, 94860, 108376, 123288, 139689, 157675, 177345, 198801, 222148, 247494, 274950 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 Simon Plouffe, Approximations de séries génératrices et quelques conjectures, Dissertation, Université du Québec à Montréal, 1992. Simon Plouffe, 1031 Generating Functions and Conjectures, Université du Québec à Montréal, 1992. Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1). FORMULA G.f.: -x*(1-2*x+4*x^2) / (x-1)^5. - Simon Plouffe in his 1992 dissertation. MATHEMATICA lst={}; Do[AppendTo[lst, n*(n+1)*(n^2-3*n+6)/8], {n, 0, 5!}]; lst (* Vladimir Joseph Stephan Orlovsky, Sep 19 2008 *) PROG (MAGMA) [n*(n+1)*(n^2-3*n+6)/8: n in [1..50]]; // Vincenzo Librandi, Jun 07 2013 (PARI) a(n)=n*(n+1)*(n^2-3*n+6)/8 \\ Charles R Greathouse IV, Oct 07 2015 CROSSREFS Partial sums of A060354. Equals (1/2) A062026. Sequence in context: A112522 A005262 A101357 * A065971 A145127 A096260 Adjacent sequences:  A004252 A004253 A004254 * A004256 A004257 A004258 KEYWORD nonn,easy AUTHOR Dennis S. Kluk (mathemagician(AT)ameritech.net) STATUS approved

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Last modified December 15 09:05 EST 2019. Contains 329995 sequences. (Running on oeis4.)