OFFSET
1,4
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,-1,0,0,0,0,0,-1).
FORMULA
G.f.: 3*(1+x+x^2)*(x^2-x+1)*(x^4-x^2+1)*x^4/((x^6-x^3+1)*(x^6+x^3+1)). - R. J. Mathar, Apr 08 2009
a(n) = - a(n-6) - a(n-12) for n > 12. - Chai Wah Wu, Feb 18 2021
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Paul Curtz, Mar 24 2009
EXTENSIONS
Edited by R. J. Mathar, Apr 08 2009
STATUS
approved