A037484 Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,2.

1, 9, 64, 450, 3151, 22059, 154414, 1080900, 7566301, 52964109, 370748764, 2595241350, 18166689451, 127166826159, 890167783114, 6231174481800, 43618221372601, 305327549608209, 2137292847257464

Offset

1,2

Links

Table of n, a(n) for n=1..19.

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

Clark Kimberling

Status

approved