OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,1,-1,0,1).
FORMULA
G.f.: (1+x+x^2)/(1-x^2+x^3-x^5);
a(2n)=A008611(n+2)=[x^n](1+x-x^2)/(1-x-x^3+x^4); a(2n+1)=[x^n](1-x-x^2)/(1-x-x^3+x^4).
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Paul Barry, Jan 19 2009
STATUS
approved