OFFSET
0,1
COMMENTS
LINKS
FORMULA
a(n) = 8*a(n-1) - 11*a(n-1) for n > 1; a(0) = 2, a(1) = 13.
G.f.: (2-3*x)/(1-8*x+11*x^2).
PROG
(Magma) Z<x>:=PolynomialRing(Integers()); N<r>:=NumberField(x^2-5); S:=[ ((2+r)*(4+r)^n+(2-r)*(4-r)^n)/2: n in [0..19] ]; [ Integers()!S[j]: j in [1..#S] ]; // Klaus Brockhaus, Jul 19 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Al Hakanson (hawkuu(AT)gmail.com), Jul 13 2009
EXTENSIONS
Edited and extended beyond a(5) by Klaus Brockhaus, Jul 19 2009
STATUS
approved