OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (18,-101,180).
FORMULA
From Mohammad K. Azarian, Dec 30 2008: (Start)
G.f.: 1/(1-4*x) + 1/(1-5*x) + 1/(1-9*x).
E.g.f.: exp(4*x) + exp(5*x) + exp(9*x). (End)
MATHEMATICA
Table[4^n + 5^n + 9^n, {n, 0, 20}]
PROG
(Magma) [4^n + 5^n + 9^n: n in [0..20]]; // Vincenzo Librandi, Aug 25 2011
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Robert G. Wilson v, Aug 23 2002
STATUS
approved