OFFSET
0,1
LINKS
Index entries for linear recurrences with constant coefficients, signature (3,0,-3,-1).
FORMULA
G.f.: -(2*x^3+x^2-6*x+2) / ((x^2+x-1)*(x^2+2*x-1)). [Joerg Arndt, Sep 03 2013]
EXAMPLE
a(0) = Pell(0) - L(0) = 0 - 2 = -2.
a(1) = Pell(1) - L(1) = 1 - 1 = 0.
a(8) = Pell(8) - L(8) = 408 - 47 = 361.
PROG
(PARI) Vec( -(2*x^3+x^2-6*x+2) / ((x^2+x-1)*(x^2+2*x-1)) +O(x^66) ) \\ Joerg Arndt, Sep 03 2013
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Jonathan Vos Post, Sep 02 2013
STATUS
approved