%I #5 Jun 13 2015 00:51:29
%S 1,12,138,1542,16878,181902,1937118,20434062,213906558,2225159022,
%T 23026431198,237237880782,2435140927038,24916268343342,
%U 254246415090078,2588217735810702,26293959622296318,266645636600666862
%N 3*10^n-2*9^n.
%C Partial sums are A097168.
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (19,-90).
%F G.f. : (1-7x)/((1-9x)(1-10x)); a(n)=19a(n-1)-90a(n-2).
%K easy,nonn
%O 0,2
%A _Paul Barry_, Jul 30 2004