login
A175604
a(n) = 8*(10^n-7).
1
24, 744, 7944, 79944, 799944, 7999944, 79999944, 799999944, 7999999944, 79999999944, 799999999944, 7999999999944, 79999999999944, 799999999999944, 7999999999999944, 79999999999999944, 799999999999999944
OFFSET
1,1
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
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jun 15 2010
STATUS
approved