OFFSET
0,9
LINKS
Index entries for linear recurrences with constant coefficients, signature (1,0,0,2,-1,0,0,-1).
FORMULA
G.f.: x^4/((1-x^4)(1-x-x^4)); a(n)=a(n-1)+2a(n-4)-a(n-5)-a(n-8).
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Oct 22 2004
STATUS
approved