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A017078 a(n) = (8*n + 1)^2. 1

%I

%S 1,81,289,625,1089,1681,2401,3249,4225,5329,6561,7921,9409,11025,

%T 12769,14641,16641,18769,21025,23409,25921,28561,31329,34225,37249,

%U 40401,43681,47089,50625,54289,58081

%N a(n) = (8*n + 1)^2.

%H Vincenzo Librandi, <a href="/A017078/b017078.txt">Table of n, a(n) for n = 0..10000</a>

%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1).

%F G.f.: ( -1 - 78*x - 49*x^2 ) / (x-1)^3. - _R. J. Mathar_, Mar 21 2016

%o (MAGMA) [(8*n+1)^2: n in [0..40]]; // _Vincenzo Librandi_, Jul 11 2011

%o (PARI) a(n)=(8*n+1)^2 \\ _Charles R Greathouse IV_, Jun 17 2017

%K nonn,easy

%O 0,2

%A _N. J. A. Sloane_

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Last modified April 19 06:59 EDT 2019. Contains 322237 sequences. (Running on oeis4.)