OFFSET
0,2
COMMENTS
LINKS
Index entries for linear recurrences with constant coefficients, signature (12, -33).
FORMULA
a(n) = ((3+sqrt(3))*(6+sqrt(3))^n+(3-sqrt(3))*(6-sqrt(3))^n)/6.
G.f.: (1-5*x)/(1-12*x+33*x^2).
PROG
(Magma) [ n le 2 select 6*n-5 else 12*Self(n-1)-33*Self(n-2): n in [1..20] ];
CROSSREFS
KEYWORD
nonn
AUTHOR
Klaus Brockhaus, Jul 13 2009
STATUS
approved