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%I #18 Dec 14 2023 05:31:25
%S 3,30,301,3013,30130,301301,3013013,30130130,301301301,3013013013,
%T 30130130130,301301301301,3013013013013,30130130130130,
%U 301301301301301,3013013013013013
%N Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 3,0,1.
%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+x^2) / ( (x-1)*(10*x-1)*(1+x+x^2) ). - _R. J. Mathar_, Aug 04 2013
%o (PARI) Vec(x*(3+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_
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