A017210 a(n) = (9*n + 4)^2.

16, 169, 484, 961, 1600, 2401, 3364, 4489, 5776, 7225, 8836, 10609, 12544, 14641, 16900, 19321, 21904, 24649, 27556, 30625, 33856, 37249, 40804, 44521, 48400, 52441, 56644, 61009, 65536, 70225

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

G.f.: ( -16 - 121*x - 25*x^2 ) / (x-1)^3. - R. J. Mathar, Jul 14 2016

Mathematica

Table[(9*n+4)^2, {n, 0, 30}] (* or *) LinearRecurrence[{3, -3, 1}, {16, 169, 484}, 30] (* Harvey P. Dale, May 06 2021 *)

Prog

(Magma) [(9*n+4)^2: n in [0..35]]; // Vincenzo Librandi, Jul 24 2011
(PARI) a(n)=(9*n+4)^2 \\ Charles R Greathouse IV, Jun 17 2017

Crossrefs

Sequence in context: A022740 A205247 A067713 * A283574 A067711 A068175

Adjacent sequences: A017207 A017208 A017209 * A017211 A017212 A017213

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved