OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (0, 2, 6, 3, -2, -1).
FORMULA
G.f.: (1+2*x+x^2-x^3)/(1-2*x^2-6*x^3-3*x^4+2*x^5+x^6).
PROG
(PARI) {a(n)=polcoeff((1+2*x+x^2-x^3)/(1-2*x^2-6*x^3-3*x^4+2*x^5+x^6)+x*O(x^n), n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Oct 25 2004
STATUS
approved