A017606 a(n) = (12*n + 7)^2.

49, 361, 961, 1849, 3025, 4489, 6241, 8281, 10609, 13225, 16129, 19321, 22801, 26569, 30625, 34969, 39601, 44521, 49729, 55225, 61009, 67081, 73441, 80089, 87025, 94249, 101761, 109561, 117649

Offset

0,1

Links

Table of n, a(n) for n=0..28.

Index entries for linear recurrences with constant coefficients, signature (3,-3,1).

Formula

G.f. ( -49-214*x-25*x^2 ) / (x-1)^3. - R. J. Mathar, Mar 10 2011

a(n) = a(n-1) + 288*n + 24, n >= 1. - Vincenzo Librandi, Mar 20 2011

Prog

(PARI) a(n)=(12*n+7)^2 \\ Charles R Greathouse IV, Jun 17 2017

Crossrefs

Sequence in context: A066429 A269327 A206255 * A206248 A100690 A157882

Adjacent sequences: A017603 A017604 A017605 * A017607 A017608 A017609

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved