OFFSET
1,1
COMMENTS
reverse(a(n)) = A086946(n).
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..300
Index entries for linear recurrences with constant coefficients, signature (11,-10).
FORMULA
a(n) = 5*10^n - 9.
From Stefano Spezia, Dec 15 2022: (Start)
O.g.f.: x*(41 + 40*x)/((1 - x)*(1 - 10*x)).
E.g.f.: 4 - 9*exp(x) + 5*exp(10*x).
a(n) = 11*a(n-1) - 10*a(n-2) for n > 2. (End)
MATHEMATICA
5*10^Range[20]-9 (* Harvey P. Dale, Nov 29 2018 *)
PROG
(Magma) [5*10^n-9: n in [1..25] ]; // Vincenzo Librandi, Aug 22 2011
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Ray Chandler, Jul 24 2003
STATUS
approved