OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (8,-7).
FORMULA
a(n) = 7*a(n-1)+6, a(0)=2.
G.f.: ( 2+4*x ) / ( (7*x-1)*(x-1) ). - R. J. Mathar, Oct 30 2011
a(n) = 8*a(n-1) - 7*a(n-2). - Harvey P. Dale, Jan 27 2012
MATHEMATICA
3*7^Range[0, 20]-1 (* or *) LinearRecurrence[{8, -7}, {2, 20}, 20] (* Harvey P. Dale, Jan 27 2012 *)
PROG
(Magma) [3*7^n-1: n in [0..30]]
(PARI) a(n)=3*7^n-1 \\ Charles R Greathouse IV, Nov 21 2011
CROSSREFS
KEYWORD
nonn,easy,less
AUTHOR
Vincenzo Librandi, Oct 28 2011
STATUS
approved