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4^n-2^n+2.
0

%I #7 Jul 28 2015 16:39:23

%S 2,4,14,58,242,994,4034,16258,65282,261634,1047554,4192258,16773122,

%T 67100674,268419074,1073709058,4294901762,17179738114,68719214594,

%U 274877382658,1099510579202,4398044413954,17592181850114,70368735789058,281474959933442,1125899873288194

%N 4^n-2^n+2.

%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (7, -14, 8).

%F a(n)= 7*a(n-1) -14*a(n-2) +8*a(n-3) = 2*A134169(n). G.f.: 2*(1-5*x+7*x^2)/((1-x) * (2*x-1) * (4*x-1)). [From _R. J. Mathar_, Feb 15 2010]

%K nonn

%O 0,1

%A _N. J. A. Sloane_, Feb 13 2010