OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (4,-3).
FORMULA
a(n) = 3*a(n-1)-1.
a(n) = 4*a(n-1)-3*a(n-2).
G.f.: (6-7*x)/((1-x)*(1-3*x)). - Bruno Berselli, Nov 04 2011
MATHEMATICA
LinearRecurrence[{4, -3}, {6, 17}, 30] (* or *) (11 3^Range[0, 30]+1)/2 (* Harvey P. Dale, Mar 25 2012 *)
PROG
(Magma) [(11*3^n+1)/2: n in [0..30]];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 04 2011
STATUS
approved