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 A037484 Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,2. 0
 1, 9, 64, 450, 3151, 22059, 154414, 1080900, 7566301, 52964109, 370748764, 2595241350, 18166689451, 127166826159, 890167783114, 6231174481800, 43618221372601, 305327549608209, 2137292847257464 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Index entries for linear recurrences with constant coefficients, signature (7,1,-7). FORMULA a(n) = 7a(n-1) + a(n-2) - 7a(n-3). a(n) = (-1)^n/16 -1/4 +3*7^n/16. G.f. x*(1+2*x) / ( (x-1)*(7*x-1)*(1+x) ). - R. J. Mathar, Nov 02 2011 CROSSREFS Sequence in context: A231822 A049684 A037540 * A013566 A056769 A273232 Adjacent sequences:  A037481 A037482 A037483 * A037485 A037486 A037487 KEYWORD nonn,base,easy AUTHOR STATUS approved

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Last modified October 22 23:18 EDT 2018. Contains 316518 sequences. (Running on oeis4.)