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%I
%S 1,12,109,984,8857,79716,717445,6457008,58113073,523017660,4707158941,
%T 42364430472,381279874249,3431518868244,30883669814197,
%U 277953028327776,2501577254949985,22514195294549868,202627757650948813,1823649818858539320,16412848369726853881
%N Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 1,3.
%H <a href="/index/Rea#recLCC">Index to sequences with linear recurrences with constant coefficients</a>, signature (9,1,-9).
%F a(n) = (3^(1+2*n)+2*(-1)^n-5)/20. a(n) = 9*a(n-1)+a(n-2)-9*a(n-3). G.f.: x*(3*x+1) / ((x-1)*(x+1)*(9*x-1)). [_Colin Barker_, Dec 27 2012]
%K nonn,base,easy
%O 1,2
%A _Clark Kimberling_
%E More terms from _Colin Barker_, Dec 27 2012
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