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 A047928 a(n) = n*(n-1)^2*(n-2). 13
 0, 12, 72, 240, 600, 1260, 2352, 4032, 6480, 9900, 14520, 20592, 28392, 38220, 50400, 65280, 83232, 104652, 129960, 159600, 194040, 233772, 279312, 331200, 390000, 456300, 530712, 613872, 706440, 809100, 922560, 1047552, 1184832 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 LINKS 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). FORMULA a(n) = A002378(n)*A002378(n+1). - Zerinvary Lajos, Apr 11 2006 a(n) = 12*A002415(n+1) = 2*A083374(n) = 4*A006011(n+1) = 6*A008911(n+1). - Zerinvary Lajos, May 09 2007 a(n) = floor((n-1)^6/((n-1)^2+1)). - Gary Detlefs, Feb 11 2010 MAPLE seq(floor(n^6/(n^2+1)), n=1..25); # Gary Detlefs, Feb 11 2010 MATHEMATICA f[n_]:=n*(n-1)^2*(n-2); f[Range[2, 60]] (* Vladimir Joseph Stephan Orlovsky, Feb 10 2011 *) PROG (MAGMA) [ n*(n-1)^2*(n-2): n in [2..40]]; // Vincenzo Librandi, May 02 2011 (PARI) a(n)=n^4 - 4*n^3 + 5*n^2 - 2*n \\ Charles R Greathouse IV, May 02, 2011 CROSSREFS Cf. A002378, A002415, A006011, A008911, A083374. Sequence in context: A304164 A199531 A188660 * A300847 A235870 A008533 Adjacent sequences:  A047925 A047926 A047927 * A047929 A047930 A047931 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified August 20 07:48 EDT 2019. Contains 326143 sequences. (Running on oeis4.)