OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (7,-6).
FORMULA
a(n) = 6*a(n-1)-5.
a(n) = 7*a(n-1)-6*a(n-2).
G.f.: (4-9*x)/((1-x)*(1-6*x)).
MATHEMATICA
3 6^Range[0, 20] +1 (* or *) LinearRecurrence[{7, -6}, {4, 19}, 30] (* Harvey P. Dale, Sep 30 2020 *)
PROG
(Magma) [3*6^n+1: n in [0..30]];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 05 2011
STATUS
approved