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%I #14 Jun 28 2023 22:12:29
%S 3,23,161,1130,7912,55384,387691,2713839,18996873,132978114,930846800,
%T 6515927600,45611493203,319280452423,2234963166961,15644742168730,
%U 109513195181112,766592366267784,5366146563874491
%N Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 3,2,0.
%H Harvey P. Dale, <a href="/A037670/b037670.txt">Table of n, a(n) for n = 1..1000</a>
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (7,0,1,-7).
%F a(1)=3, a(2)=23, a(3)=161, a(4)=1130, a(n)=7*a(n-1)+a(n-3)-7*a(n-4) [From Harvey P. Dale, Oct 15 2011]
%F G.f.: (2*x+3)/(7*x^4-x^3-7*x+1). - _Harvey P. Dale_, Oct 15 2011
%t With[{nn=10},Table[FromDigits[Take[PadLeft[{},3nn,{3,2,0}],n],7], {n,3nn}]] (* or *) LinearRecurrence[{7,0,1,-7},{3,23,161,1130},30] (* _Harvey P. Dale_, Oct 15 2011 *)
%K nonn,base,easy
%O 1,1
%A _Clark Kimberling_
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