OFFSET
0,2
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 0..10000
Index entries for linear recurrences with constant coefficients, signature (3,-3,1).
FORMULA
G.f.: ( -1-13*x^2 ) / (x-1)^3 . - R. J. Mathar, Mar 31 2014
MATHEMATICA
CoefficientList[Series[(1 + 13 x^2)/(1 - x)^3, {x, 0, 50}], x] (* Vincenzo Librandi, Apr 02 2014 *)
PROG
(Haskell)
a239449 n = (7 * n - 5) * n + 1
(Magma) [7*n^2-5*n+1: n in [0..50]]; // Vincenzo Librandi, Apr 02 2014
(PARI) a(n)=7*n^2-5*n+1 \\ Charles R Greathouse IV, Jun 17 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Reinhard Zumkeller, Mar 19 2014
STATUS
approved