OFFSET
1,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..600
Index entries for linear recurrences with constant coefficients, signature (7,-6).
FORMULA
a(n) = 6*a(n-1)+5 for n > 2; a(1) = 1, a(2) = 11.
G.f.: x*(1+4*x)/((1-x)*(1-6*x)).
PROG
(Magma) [ 6^n/3-1: n in [1..20] ];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Klaus Brockhaus, Aug 16 2009
STATUS
approved