

A037617


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


6



1, 13, 132, 1321, 13213, 132132, 1321321, 13213213, 132132132, 1321321321, 13213213213, 132132132132, 1321321321321, 13213213213213, 132132132132132, 1321321321321321, 13213213213213213, 132132132132132132, 1321321321321321321, 13213213213213213213, 132132132132132132132
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OFFSET

1,2


LINKS



FORMULA

G.f.: x*(1+x)*(2*x+1) / ( (x1)*(10*x1)*(1+x+x^2) ).  R. J. Mathar, Aug 12 2013


MATHEMATICA

Table[FromDigits[PadRight[{}, n, {1, 3, 2}]], {n, 20}] (* Harvey P. Dale, Mar 29 2015 *)


CROSSREFS



KEYWORD

nonn,base


AUTHOR



EXTENSIONS



STATUS

approved



