OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Paul Leyland, Factors of Cullen and Woodall numbers
Paul Leyland, Generalized Cullen and Woodall numbers
Index entries for linear recurrences with constant coefficients, signature (19, -99, 81).
FORMULA
From Chai Wah Wu, Feb 01 2018: (Start)
a(n) = 19*a(n-1) - 99*a(n-2) + 81*a(n-3) for n > 3.
G.f.: x*(81*x^2 - 9*x - 8)/((x - 1)*(9*x - 1)^2). (End)
MATHEMATICA
Table[n*9^n-1, {n, 20}] (* Harvey P. Dale, Feb 28 2017 *)
PROG
(Magma) [ n*9^n-1: n in [1..20]]; // Vincenzo Librandi, Sep 16 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Oct 19 2001
STATUS
approved