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%I #16 Sep 08 2022 08:45:51
%S 56,776,7976,79976,799976,7999976,79999976,799999976,7999999976,
%T 79999999976,799999999976,7999999999976,79999999999976,
%U 799999999999976,7999999999999976,79999999999999976,799999999999999976
%N 8*(10^n-3).
%H Vincenzo Librandi, <a href="/A175602/b175602.txt">Table of n, a(n) for n = 1..100</a>
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (11,-10).
%F G.f.: 8*x*(7 + 20*x)/((1 - x)*(1 - 10*x)). - _Vincenzo Librandi_, Aug 23 2014
%F a(n) = 11*a(n-1) - 10*a(n-2). - _Vincenzo Librandi_, Aug 23 2014
%t Table[8 (10^n - 3), {n, 20}] (* or *) CoefficientList[Series[8 (7 + 20 x)/((1 - x) (1 - 10 x)), {x, 0, 20}], x] (* _Vincenzo Librandi_, Aug 23 2014 *)
%t LinearRecurrence[{11,-10},{56,776},20] (* _Harvey P. Dale_, Sep 26 2018 *)
%o (Magma) [8*(10^n-3): n in [1..20]]; // _Vincenzo Librandi_, Aug 23 2014
%K nonn
%O 1,1
%A _Vincenzo Librandi_
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