OFFSET
6,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 6..10000
FORMULA
G.f.: -(x^4-x^2-1)*x^6/((x^2+1)*(x^2+x+1)*(x+1)^2*(x-1)^4).
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Oct 16 2018
STATUS
approved