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%I #7 Jun 13 2015 00:49:16
%S 1,9,64,449,3145,22016,154113,1078793,7551552,52860865,370026057,
%T 2590182400,18131276801,126918937609,888432563264,6219027942849,
%U 43533195599945,304732369199616,2133126584397313
%N Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,1.
%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*(1+x)^2 / ( (x-1)*(7*x-1)*(1+x+x^2) ). - _R. J. Mathar_, Apr 30 2015
%K nonn,base,easy
%O 1,2
%A _Clark Kimberling_
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