OFFSET
0,4
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,0,0,2,0,0,0,-1).
FORMULA
From R. J. Mathar, Aug 15 2010: (Start)
a(n) = 2*a(n-4) - a(n-8).
G.f.: x*(1+x+2*x^2) / ( (x-1)^2*(1+x)^2*(x^2+1)^2 ). (End)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Amela2(AT)aol.com
STATUS
approved