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Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 2,2,1.
0

%I #7 Jun 13 2015 00:49:16

%S 2,16,113,793,5553,38872,272106,1904744,13333209,93332465,653327257,

%T 4573290800,32013035602,224091249216,1568638744513,10980471211593,

%U 76863298481153,538043089368072,3766301625576506

%N Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 2,2,1.

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (7,0,1,-7).

%F G.f.: x*(2+2*x+x^2) / ( (x-1)*(7*x-1)*(1+x+x^2) ). - _R. J. Mathar_, Apr 30 2015

%K nonn,base,easy

%O 1,1

%A _Clark Kimberling_