A175604 a(n) = 8*(10^n-7).

24, 744, 7944, 79944, 799944, 7999944, 79999944, 799999944, 7999999944, 79999999944, 799999999944, 7999999999944, 79999999999944, 799999999999944, 7999999999999944, 79999999999999944, 799999999999999944

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..100

Index entries for linear recurrences with constant coefficients, signature (11,-10).

Formula

G.f.: 8*x*(3 + 60*x)/((1 - x)*(1 - 10*x)). - Vincenzo Librandi, Aug 24 2014

a(n) = 11*a(n-1) - 10*a(n-2). - Vincenzo Librandi, Aug 24 2014

a(n) = 10*a(n-1) + 504. - Robert Israel, Aug 24 2014

Mathematica

Table[8 (10^n - 7), {n, 20}] (* or *) CoefficientList[Series[8 (3 + 60 x)/((1 - x) (1 - 10 x)), {x, 0, 20}], x] (* Vincenzo Librandi, Aug 24 2014 *)

Prog

(Magma) [8*(10^n-7): n in [1..20]]; // Vincenzo Librandi, Aug 24 2014

Crossrefs

Sequence in context: A239815 A279659 A062528 * A283873 A359480 A361661

Adjacent sequences: A175601 A175602 A175603 * A175605 A175606 A175607

Keyword

nonn,easy

Author

Vincenzo Librandi, Jun 15 2010

Status

approved