OFFSET
0,1
LINKS
FORMULA
From Mohammad K. Azarian, Jan 11 2009: (Start)
G.f.: 1/(1-6*x) + 1/(1-9*x).
E.g.f.: e^(6*x) + e^(9*x). (End)
a(n) = 15*a(n-1) - 54*a(n-2) with a(0)=2, a(1)=15. - Vincenzo Librandi, Jul 21 2010
MATHEMATICA
Table[6^n + 9^n, {n, 0, 20}]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Robert G. Wilson v, Aug 26 2002
STATUS
approved