OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (20, -100).
FORMULA
a(n) = 20*a(n-1) - 100*a(n-2), a(0) = 1, a(1) = 11.
a(n) = (n + 10)*10^(n-1).
G.f.: (1 - 9*x)/(1 - 10*x)^2.
E.g.f.: exp(10*x)*(1 + x). - Stefano Spezia, Mar 04 2023
MATHEMATICA
CoefficientList[Series[(1 - 9 x) / (1 - 10 x)^2, {x, 0, 20}], x] (* Vincenzo Librandi, Aug 06 2013 *)
PROG
(Magma) [(n+10)*10^(n-1): n in [0..25]]; // Vincenzo Librandi, Aug 06 2013
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Mar 07 2003
STATUS
approved