OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (21,-119,99).
FORMULA
G.f.: 1/(1-11*x)-1/(1-9*x)+1/(1-x). E.g.f.: e^(11*x)-e^(9*x)+e^x.
a(n)=20*a(n-1)-99*a(n-2)+80 with a(0)=1, a(1)=3 [From Vincenzo Librandi, Jul 21 2010]
MATHEMATICA
Table[11^n-9^n+1, {n, 0, 30}] (* or *) LinearRecurrence[{21, -119, 99}, {1, 3, 41}, 30] (* Harvey P. Dale, May 07 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Mohammad K. Azarian, Feb 01 2009
STATUS
approved