OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..900
Index entries for linear recurrences with constant coefficients, signature (12,-11).
FORMULA
a(n) = 11*a(n-1) + 10.
a(n) = 12*a(n-1) - 11*a(n-2).
From Bruno Berselli, Nov 03 2011: (Start)
G.f.: 2*(4+x)/((1-x)*(1-11*x)).
a(n) = 2*A199028(n). (End)
From Elmo R. Oliveira, May 07 2025: (Start)
E.g.f.: exp(x)*(9*exp(10*x) - 1).
a(n) = A199763(n) - 2. (End)
PROG
(Magma) [9*11^n-1: n in [0..20]];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 03 2011
STATUS
approved