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%I #7 Jun 13 2015 00:49:16
%S 2,20,181,1631,14681,132130,1189172,10702550,96322951,866906561,
%T 7802159051,70219431460,631974883142,5687773948280,51189965534521,
%U 460709689810691,4146387208296221
%N Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 2,2,1.
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (9,0,1,-9).
%F G.f.: x*(2+2*x+x^2) / ( (x-1)*(9*x-1)*(1+x+x^2) ). - _R. J. Mathar_, Apr 30 2015
%K nonn,base,easy
%O 1,1
%A _Clark Kimberling_