A037722 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,0,1,3.

2, 20, 201, 2013, 20132, 201320, 2013201, 20132013, 201320132, 2013201320, 20132013201, 201320132013, 2013201320132, 20132013201320, 201320132013201, 2013201320132013

Offset

1,1

Links

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

Index entries for linear recurrences with constant coefficients, signature (11,-11,11,-10).

Formula

G.f.: x*(2-2*x+3*x^2) / ( (x-1)*(10*x-1)*(x^2+1) ). - R. J. Mathar, Nov 21 2011

Prog

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

Crossrefs

Sequence in context: A136884 A093136 A037519 * A109107 A037729 A037624

Adjacent sequences: A037719 A037720 A037721 * A037723 A037724 A037725

Keyword

nonn,base,easy

Author

Clark Kimberling

Status

approved