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%I #25 Dec 25 2023 11:26:14
%S 4,9,32,119,444,1657,6184,23079,86132,321449,1199664,4477207,16709164,
%T 62359449,232728632,868555079,3241491684,12097411657,45148154944,
%U 168495208119,628832677532,2346835502009,8758509330504,32687201820007
%N a(0)=4, a(1)=9, a(n) = 4a(n-1) - a(n-2).
%H Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (4,-1).
%F G.f.: (4-7x)/(1-4x+x^2). - _Philippe Deléham_, Nov 16 2008
%t Transpose[NestList[{Last[#],4Last[#]-First[#]}&,{4,9},40]][[1]] (* _Harvey P. Dale_, Mar 09 2011 *)
%K nonn,easy
%O 0,1
%A _N. J. A. Sloane_, Nov 09 2000
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