A199557 10*8^n+1.

11, 81, 641, 5121, 40961, 327681, 2621441, 20971521, 167772161, 1342177281, 10737418241, 85899345921, 687194767361, 5497558138881, 43980465111041, 351843720888321, 2814749767106561, 22517998136852481, 180143985094819841

Offset

0,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (9,-8).

Formula

a(n) = 8*a(n-1)-7.

a(n) = 9*a(n-1)-8*a(n-2).

G.f.: (11-18*x)/((1-x)*(1-8*x)).

Prog

(Magma) [10*8^n+1: n in [0..30]];

Crossrefs

Sequence in context: A055429 A227556 A181989 * A003730 A334340 A335332

Adjacent sequences: A199554 A199555 A199556 * A199558 A199559 A199560

Keyword

nonn,easy

Author

Vincenzo Librandi, Nov 08 2011

Status

approved