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%I #29 Sep 08 2022 08:44:41
%S 4,64,196,400,676,1024,1444,1936,2500,3136,3844,4624,5476,6400,7396,
%T 8464,9604,10816,12100,13456,14884,16384,17956,19600,21316,23104,
%U 24964,26896,28900,30976,33124,35344
%N a(n) = (6*n + 2)^2.
%H Vincenzo Librandi, <a href="/A016934/b016934.txt">Table of n, a(n) for n = 0..2000</a>
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (3,-3,1).
%F Sum_{n>=0} 1/a(n) = A086728. - _Amiram Eldar_, Nov 16 2020
%t (6*Range[0,40]+2)^2 (* or *) LinearRecurrence[{3,-3,1},{4,64,196},40] (* _Harvey P. Dale_, Nov 22 2013 *)
%o (Magma) [(6*n+2)^2: n in [0..50]]; // _Vincenzo Librandi_, May 04 2011
%o (PARI) a(n)=(6*n+2)^2 \\ _Charles R Greathouse IV_, Jun 17 2017
%Y Cf. A016922, A016933, A086728.
%K nonn,easy
%O 0,1
%A _N. J. A. Sloane_
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