OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..740
Index entries for linear recurrences with constant coefficients, signature (4, -6, 4, -1).
MATHEMATICA
Table[-(1/2)(n+2)(n^2-6n-1), {n, 0, 40}] (* or *) LinearRecurrence[{4, -6, 4, -1}, {1, 9, 18, 25}, 40] (* Harvey P. Dale, Sep 08 2018 *)
PROG
(Magma) [-1/2*(n+2)*(n^2-6*n-1): n in [0..40]]; // Vincenzo Librandi, Apr 27 2011
(PARI) a(n)=-(n+2)*(n^2-6*n-1)/2 \\ Charles R Greathouse IV, Oct 18 2022
CROSSREFS
KEYWORD
sign,easy
AUTHOR
STATUS
approved