OFFSET
0,6
LINKS
Index entries for linear recurrences with constant coefficients, signature (2,-1,0,0,0,0,1,-2,1).
FORMULA
a(n) = +2*a(n-1) -a(n-2) +a(n-7) -2*a(n-8) +a(n-9). G.f.: x^4*(x^2+1)/ ((1-x)^3 * (1+x+x^2+x^3+x^4+x^5+x^6)). [R. J. Mathar, Apr 15 2010]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved