A037771 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 3,0,2,1.

3, 30, 302, 3021, 30213, 302130, 3021302, 30213021, 302130213, 3021302130, 30213021302, 302130213021, 3021302130213, 30213021302130, 302130213021302, 3021302130213021

Offset

1,1

Links

Table of n, a(n) for n=1..16.

Index entries for linear recurrences with constant coefficients, signature (10,0,0,1,-10).

Formula

G.f.: x*(3+2*x^2+x^3) / ( (x-1)*(10*x-1)*(1+x)*(x^2+1) ). - R. J. Mathar, Aug 04 2013

Prog

(PARI) Vec(x*(3+2*x^2+x^3)/((x-1)*(10*x-1)*(1+x)*(x^2+1)) + O(x^25)) \\ Jinyuan Wang, Apr 14 2020

Crossrefs

Sequence in context: A073557 A037764 A037652 * A037659 A131586 A163475

Adjacent sequences: A037768 A037769 A037770 * A037772 A037773 A037774

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved