%I
%S 4,19,109,649,3889,23329,139969,839809,5038849,30233089,181398529,
%T 1088391169,6530347009,39182082049,235092492289,1410554953729,
%U 8463329722369,50779978334209,304679870005249,1828079220031489,10968475320188929
%N 3*6^n+1.
%H Vincenzo Librandi, <a href="/A199318/b199318.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (7,6).
%F a(n) = 6*a(n1)5.
%F a(n) = 7*a(n1)6*a(n2).
%F G.f.: (49*x)/((1x)*(16*x)).
%t 3 6^Range[0,20] +1 (* or *) LinearRecurrence[{7,6},{4,19},30] (* _Harvey P. Dale_, Sep 30 2020 *)
%o (MAGMA) [3*6^n+1: n in [0..30]];
%K nonn,easy
%O 0,1
%A _Vincenzo Librandi_, Nov 05 2011
