OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..10000
Index entries for linear recurrences with constant coefficients, signature (3,-3,1).
FORMULA
a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3); a(0)=4, a(1)=121, a(2)=400. - Harvey P. Dale, Apr 16 2013
G.f.: ( -4 - 109*x - 49*x^2 ) / (x-1)^3. - R. J. Mathar, Jul 14 2016
MAPLE
seq((9*n+2)^2, n=0..30); # Muniru A Asiru, Oct 20 2018
MATHEMATICA
(9Range[0, 30]+2)^2 (* or *) LinearRecurrence[{3, -3, 1}, {4, 121, 400}, 30] (* Harvey P. Dale, Apr 16 2013 *)
PROG
(Magma) [(9*n+2)^2: n in [0..35]]; // Vincenzo Librandi, Jul 23 2011
(PARI) a(n)=(9*n+2)^2 \\ Charles R Greathouse IV, Jun 17 2017
(GAP) List([0..30], n->(9*n+2)^2); # Muniru A Asiru, Oct 20 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved