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%I #11 Oct 14 2015 15:53:58
%S 2,15,105,738,5168,36177,253239,1772676,12408734,86861139,608027973,
%T 4256195814,29793370700,208553594901,1459875164307,10219126150152,
%U 71533883051066,500737181357463,3505160269502241
%N Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,0,3.
%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (7,0,0,1,-7).
%F a(n) = 7a(n-1) + a(n-4) - 7a(n-5).
%F G.f.: ( x*(2+x+3*x^3) ) / ( (x-1)*(7*x-1)*(1+x)*(1+x^2) ). - _R. J. Mathar_, Oct 14 2015
%K nonn,base,easy
%O 1,1
%A _Clark Kimberling_
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