OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (11,-10).
FORMULA
a(n) = 10*a(n-1)-9.
a(n) = 11*a(n-1)-10*a(n-2).
G.f.: 3*(4-7*x)/((1-x)*(1-10*x)).
MATHEMATICA
11 10^Range[0, 20]+1 (* or *) LinearRecurrence[{11, -10}, {12, 111}, 20] (* Harvey P. Dale, Jan 29 2023 *)
PROG
(Magma) [11*10^n+1: n in [0..30]];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 09 2011
STATUS
approved