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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
1, 12, 120, 1201, 12012, 120120, 1201201, 12012012, 120120120, 1201201201, 12012012012, 120120120120, 1201201201201, 12012012012012, 120120120120120, 1201201201201201 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

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

FORMULA

a(n)=10*a(n-1)+(n mod 3), with a(0)=0 [From Paolo P. Lava, Jul 30 2009]

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

CROSSREFS

Sequence in context: A129332 A004291 A001754 * A037694 A242810 A067102

Adjacent sequences:  A037508 A037509 A037510 * A037512 A037513 A037514

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 21 11:34 EDT 2019. Contains 328296 sequences. (Running on oeis4.)