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%I #20 Sep 08 2022 08:45:59
%S 1,0,80,970,9960,99950,999940,9999930,99999920,999999910,9999999900,
%T 99999999890,999999999880,9999999999870,99999999999860,
%U 999999999999850,9999999999999840,99999999999999830,999999999999999820
%N 10^n-10*n.
%H Vincenzo Librandi, <a href="/A198400/b198400.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (12,-21,10).
%F a(n) = 12*a(n-1)-21*a(n-2)+10*a(n-3) for n>2.
%F G.f.: (1-12*x+101*x^2)/((1-10*x)*(1-x)^2). - _Vincenzo Librandi_, Jul 06 2012
%t CoefficientList[Series[(1-12*x+101*x^2)/((1-10*x)*(1-x)^2),{x,0,40}],x] (* _Vincenzo Librandi_, Jul 06 2012 *)
%o (Magma) [10^n-10*n: n in [0..25]];
%o (PARI) a(n)=10^n-10*n \\ _Charles R Greathouse IV_, Jul 06 2017
%Y Cf. A005803, A107583, A107584, A107585.
%K nonn,easy
%O 0,3
%A _Vincenzo Librandi_, Oct 26 2011
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