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)=49, a(1)=256, a(2)=625. - Harvey P. Dale, Apr 24 2016
G.f.: -(49 + 109*x + 4*x^2)/(x-1)^3. - R. J. Mathar, Mar 20 2018
MATHEMATICA
(9*Range[0, 30]+7)^2 (* or *) LinearRecurrence[{3, -3, 1}, {49, 256, 625}, 30] (* Harvey P. Dale, Apr 24 2016 *)
PROG
(Magma) [(9*n+7)^2: n in [0..35]]; // Vincenzo Librandi, Jul 27 2011
(PARI) a(n)=(9*n+7)^2 \\ Charles R Greathouse IV, Jun 17 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved