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Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 3,0,2.
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%I #19 Dec 14 2023 05:31:29

%S 3,30,302,3023,30230,302302,3023023,30230230,302302302,3023023023,

%T 30230230230,302302302302,3023023023023,30230230230230,

%U 302302302302302,3023023023023023

%N Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 3,0,2.

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (10,0,1,-10).

%F G.f.: x*(3+2*x^2) / ( (x-1)*(10*x-1)*(1+x+x^2) ). - _R. J. Mathar_, Aug 04 2013

%o (PARI) Vec(x*(3+2*x^2)/((x-1)*(10*x-1)*(1+x+x^2)) + O(x^25)) \\ _Jinyuan Wang_, Apr 14 2020

%K nonn,base,easy

%O 1,1

%A _Clark Kimberling_