OFFSET
1,8
FORMULA
F(k) denotes the k-th Fibonacci number: a(6k)=-F(k); a(6k+1)=0; a(6k+2)=a(6k+3)=F(k+2); a(6k+4)=0; a(6k+5)=-F(k+1).
Empirical g.f.: x*(x^12-x^8-x^7+x^6+x^5+x^4-x^2-x-1) / (x^12+x^6-1). - Colin Barker, Oct 14 2014
CROSSREFS
KEYWORD
frac,sign
AUTHOR
Benoit Cloitre, Nov 26 2002
STATUS
approved