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A037511 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,2,0. 5

%I

%S 1,12,120,1201,12012,120120,1201201,12012012,120120120,1201201201,

%T 12012012012,120120120120,1201201201201,12012012012012,

%U 120120120120120,1201201201201201

%N Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,2,0.

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

%F a(n)=10*a(n-1)+(n mod 3), with a(0)=0 [From _Paolo P. Lava_, Jul 30 2009]

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

%K nonn,base

%O 1,2

%A _Clark Kimberling_

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Last modified November 20 17:09 EST 2019. Contains 329337 sequences. (Running on oeis4.)