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.: x*(10 + 80*x)/((1 - x)*(1 - 10*x)). - Vincenzo Librandi, Aug 20 2014
MATHEMATICA
Table[(2 (10^n - 5)), {n, 1, 20}] (* or *) CoefficientList[Series[(10 + 80 x)/((1 - x) (1 - 10 x)), {x, 0, 20}], x] (* Vincenzo Librandi, Aug 20 2014 *)
LinearRecurrence[{11, -10}, {10, 190}, 20] (* Harvey P. Dale, Aug 20 2023 *)
PROG
(Magma) [2*(10^n-5): n in [1..20]]; // Vincenzo Librandi, Aug 20 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved